added test for xIsVariadic
added test for xJoin
added support for more parametres to MakeFun
removed unneeded calls to match.call and toString, for efficiency
simplified code generation in makefun
added a test for reversed partially applied functions, and added minor speedups to type conversiong
minor speedup
remvoed no-character filtering from several functions.
removed direct use of strsplit, and removed several explicit type conversions
Bumped versions.
updated news
Merge branch 'develop' into releases