Added missing string conversions in regexp handling
Handled escaping in NamedRegExps
Fixed translation of regexps with non-lineair variables.
Fixed escaping of ( in regexps
Fixed non-capturing groups in regexps
Fixed escape in named regexp.
Clean-u of regexp code
Started spreadsheet to monitor testing progress.
Merge branch 'master' of https://github.com/cwi-swat/rascal.git