Add --overwriteWithoutBackup flag for usage with pre-commit

Spamming backup files for files that are already managed by git is
pointless.

By using this new flag, the user explicitly states that he or she wants
to overwrite the files without backup. There is no short option to avoid
triggering this option by accident and the help text should be pretty
clear that using this option is not recommended unless you know what
you're doing. Hence, the risk of accidental data loss something should
be pretty much non-existant.

Also note that almost every other source code formatter has options to
to reformat and overwrite files without creating a backup.

Fixes cmhughes#333.

LatexIndent/Document.pm

@@ -112,6 +112,7 @@ sub latexindent{
       # overwrite and overwriteIfDifferent switches, per file
       ${$self}{overwrite} = $switches{overwrite};
       ${$self}{overwriteIfDifferent} = $switches{overwriteIfDifferent};
+      ${$self}{overwriteWithoutBackup} = $switches{overwriteWithoutBackup};
 
       # the main operations
       $self->operate_on_file;
@@ -211,7 +212,7 @@ sub output_indented_text{
     $logger->info("*Output routine:");
 
     # if -overwrite is active then output to original fileName
-    if(${$self}{overwrite}){
+    if(${$self}{overwrite} || ${$self}{overwriteWithoutBackup}){
         $logger->info("Overwriting file ${$self}{fileName}");
         open(OUTPUTFILE,">",${$self}{fileName});
         print OUTPUTFILE ${$self}{body};

LatexIndent/LogFile.pm

@@ -64,6 +64,8 @@ usage: latexindent.pl [options] [file]
       -wd, --overwriteIfDifferent
           overwrite the current file IF the indented text is different from original; 
           a backup will be made, but still be careful
+      --overwriteWithoutBackup
+          overwrite the current file; NO BACKUP WILL BE MADE, USE AT YOUR OWN RISK!
       -s, --silent
           silent mode: no output will be given to the terminal
       -t, --trace

latexindent.pl

@@ -40,6 +40,7 @@
     "onlydefault|d"=>\$switches{onlyDefault},
     "overwrite|w"=>\$switches{overwrite},
     "overwriteIfDifferent|wd"=>\$switches{overwriteIfDifferent},
+    "overwriteWithoutBackup"=>\$switches{overwriteWithoutBackup},
     "outputfile|o=s"=>\$switches{outputToFile},
     "modifylinebreaks|m"=>\$switches{modifyLineBreaks},
     "logfile|g=s"=>\$switches{logFileName},