template: fix VleUtilsConfig.cmake script

Blanks characters (spaces and tabulations) into Description fields
were not suppressed before checking empty strings.
vpz: fix default simulation_engine condition

Vpz::parseMemory adds condition values to a Vpz::vpz which has already a
simulation_engine condition. Before using parseMemory one has to remove
the default values of simulation_engine condition. This is is the same for
parseFile (it fixes some tests in vle and packages).
gvle: fix the tuple editor dialog

(closes #184)
vle: patch for compiling under Mac OS

A patch from Quanteek for compiling VLE under (at least) Mac OS 10.9.
Quanteek uses libraries from macports with clang.