Track location of InstallMethod and InstallImmediateMethod

[fingolfin]

This PR makes the information displayed by TraceMethods and by ApplicableMethod much more useful in many case, which resolves #2239. For example, consider this method for AsList, installed in coll.gi:

InstallMethod( AsList,
    "for collections that are constant time access lists",
    [ IsCollection and IsConstantTimeAccessList ],
    Immutable );

With GAP 4.8, no location information is shown at all:

gap> TraceMethods(AsList); AsList("abc");;
#I  AsList: for collections that are constant time access lists

With GAP 4.9 / master, the location where the method (i.e., the
underlying function) was defined is shown, which already does the job in
many cases, but not here:

gap> TraceMethods(AsList); AsList("abc");;
#I  AsList: for collections that are constant time access lists at src/objects.c:fail

With this PR, we get this (note that instead of GAPROOT, the actual path
is printed)

gap> TraceMethods(AsList); AsList("abc");;
#I  AsList: for collections that are constant time access lists at GAPROOT/lib/coll.gi:302

For we immediate methods, this is what we got before this PR:

gap> TraceImmediateMethods( );
gap> g:= Group( (1,2,3), (1,2) );;
#I  immediate: Size
#I  immediate: IsCyclic
#I  immediate: IsCommutative
#I  immediate: IsTrivial
gap>
gap> M0:=Magma(FamilyObj([1]), []);;
gap> AsSSortedList(M0);
#I  immediate: RepresentativeSmallest
#I  immediate: AsList
#I  immediate: EnumeratorSorted
#I  immediate: GeneratorsOfDomain
#I  immediate: Size
#I  immediate: RepresentativeSmallest
#I  immediate: IsFinite
#I  immediate: IsTrivial
#I  immediate: IsEmpty
#I  immediate: IsNonTrivial
#I  immediate: Size
#I  immediate: RepresentativeSmallest
[  ]

After (note how e.g. the entry for EnumeratorSorted points at
coll.gi:379, and not at the location where the method function
was defined):

gap> TraceImmediateMethods( );
gap> g:= Group( (1,2,3), (1,2) );;
#I RunImmediateMethods
#I  immediate: Size at GAPROOT/lib/coll.gi:179
#I  immediate: IsCyclic at GAPROOT/lib/grp.gi:40
#I  immediate: IsCommutative at GAPROOT/lib/magma.gi:196
#I  immediate: IsTrivial at GAPROOT/lib/magma.gi:130
gap>
gap> M0:=Magma(FamilyObj([1]), []);;
#I RunImmediateMethods
#I RunImmediateMethods
gap> AsSSortedList(M0);
#I RunImmediateMethods
#I  immediate: RepresentativeSmallest at GAPROOT/lib/coll.gi:226
#I  immediate: AsList at GAPROOT/lib/domain.gi:206
#I  immediate: EnumeratorSorted at GAPROOT/lib/coll.gi:379
#I  immediate: GeneratorsOfDomain at GAPROOT/lib/domain.gi:181
#I  immediate: Size at GAPROOT/lib/coll.gi:183
#I  immediate: RepresentativeSmallest at GAPROOT/lib/coll.gi:215
#I  immediate: IsFinite at GAPROOT/lib/coll.gi:148
#I  immediate: IsTrivial at GAPROOT/lib/coll.gi:116
#I  immediate: IsEmpty at GAPROOT/lib/coll.gi:97
#I  immediate: IsNonTrivial at GAPROOT/lib/coll.gi:134
#I RunImmediateMethods
#I  immediate: Size at GAPROOT/lib/coll.gi:179
#I RunImmediateMethods
#I  immediate: RepresentativeSmallest at GAPROOT/lib/coll.gi:215
[  ]

[fingolfin]

BTW, while I found outputting RunImmediateMethods helpful for debugging, not everybody might agree, so I can remove this again. Or perhaps we should have different levels of tracing: off = level 0; level 1 = only print the invoked methods; level 2: also print the RunImmediateMethods string, and perhaps in addition, print the value of RUN_IMMEDIATE_METHODS_RUNS (and print RUN_IMMEDIATE_METHODS_CHECKS next to each executed method).
We then might also want to use an InfoLevel (and perhaps Info, though I am less clear on that; in any case, one can use an InfoLevel without Info just fine)

[hulpke]

Very useful.

[ThomasBreuer]

This is a nice feature.
I think it is not necessary to make the output of
RunImmediateMethods optional.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@44a4f35). Click here to learn what that means.
The diff coverage is 72.38%.

@@            Coverage Diff            @@
##             master    #2393   +/-   ##
=========================================
  Coverage          ?   73.54%           
=========================================
  Files             ?      482           
  Lines             ?   240853           
  Branches          ?        0           
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  Hits              ?   177142           
  Misses            ?    63711           
  Partials          ?        0

Impacted Files	Coverage Δ
lib/profile.g	13.8% <0%> (ø)
src/c_type1.c	84.01% <100%> (ø)
src/opers.c	92% <100%> (ø)
hpcgap/src/c_type1.c	81.82% <100%> (ø)
lib/methsel.g	43.24% <38.46%> (ø)
lib/methwhy.g	50% <57.14%> (ø)
hpcgap/src/c_oper1.c	89.03% <74.6%> (ø)
src/c_oper1.c	90.42% <75.19%> (ø)
lib/oper.g	81.18% <77.77%> (ø)

[fingolfin]

@ThomasBreuer this, however, breaks a function in Browse for browsing methods. To fix this, Browse needs to be changed to use BASE_SIZE_METHODS_OPER_ENTRY when it iterates over the methods (this will make it future proof against further additions). To keep it compatible with older GAP versions, you could simply bind it to the old value 4 if missing.