Programmer's Guide: Address some common mistakes
(Fixed outdated license in Manual)
OSGi execution environment header was tweaked again, now it's Bundle-RequiredExecutionEnvironment: J2SE-1.5, J2SE-1.4. That is, we prefer (and compile against) 1.5, but only require 1.4.
(Fix outdated Java Pattern API link)
Added new string built-ins:  keep_until(substring[, flags]), remove_ending(substring), remove_beginning(substring), ensure_starts_with(substring), ensure_ends_with(substring). Also moved split(...) from regexp BI-s to basic BI-s.
- Renamed ?keep_until to ?keep_before, and added ?keep_after.

- ?ensure_starts_with now has 2 (and 3) parameter overloaded that uses regular expressions, like in: someURL?ensure_starts_with("[a-zA-Z]+://", "http://").
- Manual update to include the recent new built-ins.
- Some code cleanup.
(Manual updated for RC2)
(Added links to slicing-related built-ins in the section about slicing expressions.)
(Links to ?ensure_starts_with and ?ensure_ends_with from ?starts_with and ?ends_with)
(Minor Manual fixes)
Merge branch '2.3-gae' into 2.3