added substring() YCP builtin
no space between functinon name and parenthesis
use -1 default for substring()
added toupper() and tolower() builtins
added comment
added size() YCP built-in

(with String, Array, Hash support so far)
added support for YCP::Term in size() builtin
added time() builtin
added issubstring() YCP built-in
added splitstring() YCP built-in
added regexpmatch() YCP built-in
added mergestring() YCP built-in
added find() YCP built-in (for strings)
added regexpsub() YCP built-in
addded regexptokenize() YCP built-in
added FIXME notes
added contains() YCP built-in
added setcontains() YCP built-in
added merge() YCP built-in
added sort() YCP built-in (for single type arrays only)