gdl command switches

GDL reproduces all the IDL switches (most of them being without object as GDL has an Open Source code)

One can change the behaviour of GDL using the following switches:

• --fakerelease X.y : pretend that !VERSION.RELEASE is X.y
• --fussy : implies that procedures adhere with modern IDL, where "()" are for functions and "[]" are for arrays. This speeds up (sometimes terribly) compilation but choke on every use of "()" with arrays. Conversion of procedures to modern IDL can be done with D. Landsman's idlv4_to_v5 procedure. Use enviromnment variable "GDL_IS_FUSSY" to set up permanently this feature.
• --sloppy : Sets the traditional (default) compiling option where "()" can be used both with functions and arrays. Needed to counteract temporarily the effect of the enviromnment variable "GDL_IS_FUSSY".
• --MAC : Graphic device will be called 'MAC' on MacOSX. (default: 'X')
• [--no-use-wx | -X] : Tells GDL not to use WxWidgets graphics and resort to X11 (if available). Also enabled by setting the environment variable GDL_DISABLE_WX_PLOTS to a non-null value.
• --notebook : Force SVG-only device, used only when GDL is a Python Notebook Kernel.
• --widget-compat : Tells GDL to use a default (rather ugly) fixed pitch font for compatiblity with IDL widgets. Also enabled by setting the environment variable GDL_WIDGET_COMPAT to a non-null value. Using this option may render some historical widgets more readable (as they are based on fixed sizes).
• --no-dSFMT : Tells GDL not to use double precision SIMD oriented Fast Mersenne Twister(dSFMT) for random doubles. Also disable by setting the environment variable GDL_NO_DSFMT to a non-null value.
• --with-eigen-transpose : lets GDL use Eigen::transpose and related functions instead of our accelerated transpose function. Normally slower.
• --smart-tpool : switch to a mode where the number of threads is adaptive (experimental). Should enable better perfs on many core machines.
• **--silent ** : Supresses some messages (mainly "Compiled Module XXX") .