Merge some changes from the Kommander 1.3.0 working branch created by Michal in 2006...

Summary of changes:
o function str_findrev works now
o fix crash when diving by zero
o make function names case insensitive
o fix dcop() function (external DCOP) in new parser
o add missing EOLs to array_values()
o don't open files with no filename given
o fix crash on incorrect syntax in new parser
o fix input_file() function
o add switch/case to new parser
o fix importing tables with empty cells