* libexslt/Makefile.am libexslt/exslt.[ch] libexslt/strings.c:
added implementation of EXSLT - Strings.
Currently implemented functins are str:tokenize, str:align
str:concat and str:padding.
* configure.in tests/exslt/Makefile.am
tests/exslt/strings/Makefile.am
tests/exslt/strings/tokenize.1.*: added a test for the
str:tokenize function.