ObjectScript Code

checkin changes from last night (internet is down at home):

now instead of converting a `for` loop to a `while` loop, the opposite is done. This is needed to propery evaluate the post-loop-expression in the case of a `continue`.

need to catch and rethrow java exceptions, so that they can be caught by script code

fix problem with detecting changed plugins... was getting confused by a rel_x.y.z branch listed in a log message from merging from another mainline. Only filter release branches if there is no leading whitespace on the line

fixes this issue with interpreted (but not compiled) code:
{{{
ObjectScript 2.11.0 (r1995)
os> [1,2,3][1..2]
java.lang.NullPointerException
at oscript.data.OArray.idx(OArray.java:316)
at oscript.data.OArray.elementsAt(OArray.java:374)
}}}

not too suprisingly, this is the one test case that is commented out (because `[1,2] != [1,2]`).. need to add a test case for this somehow.

add `pkg.xml.encode()` utility, and make `pkg.fs` more consistent w.r.t. accepting files or paths

fix for extracting the lib files... by the time the build is done, the plugins are packed as .jar files for pushing to the update site. So we need to mount the .jar file and copy the .jar files it contains. Plus fixes to get rid of warning messages in the customBuildCallbacks.xml and addition of pkg.fs.wpath() API for getting a platform native path

sync up build script with latest from PLATO repo (build script re-use ;-))

fix problem in analysing copy history.. the trunk can be the common ancestor

some debug logging for pkg.svn

some hacks to properly handle windows paths