merge default into stable for code freeze

convert: fix Python syntax in 'splice in' message Instead of reporting spliced in ['82544090e14fe18091e04f1fb0f0d7991cbe6e7e'] as parents of 369fd983d9e13330e9f12d9fce820deae84ea223 report spliced in 82544090e14fe18091e04f1fb0f0d7991cbe6e7e as parents of 369fd983d9e13330e9f12d9fce820deae84ea223

rebase: fix wrong 'no changes to commit' when using --collapse --collapse will do that rebase doesn't commit until the final commit. The lack of a new commit would make it look like the rebase didn't contribute any changes. Instead, only warn about no commits when not using --collapse.

pull: all pass along extra opargs Wihtout this patch, commands.pull silently drops opargs defeating the whole purpose of the argument.

push: all pass along opargs Wihtout this patch, commands.push silently drops opargs defeating the whole purpose of the argument.

check-code: allow argument passing py2.6ism this backs out 131f7fe06e9e, because Python2.5 support was dropped

mail: drop python 2.5 self.sock.read workaround

url: drop support for python2.5

win32: drop reference to python2.5

editmerge: dequote other use of $ED We want to support editors with parameters, eg EDITOR="vim -O" or whatever. So remove the quotes from around $ED and assume that the editor variable is properly escaped already.