Fix debugrename --rev option

Updated copyright notices and add "and others" to "hg version"

Use printenv.py for pre/post-command-hooks (fixes tests on Solaris, too)

Cleanup of whitespace, indentation and line continuation.

dispatch: report failed imports nicely

demandimport: fix issue579 and add a test fix suggested by Brendan

dispatch: add generic pre- and post-command hooks

Fixes to not require administrator privleges and use private copies of DLLs when running the Windows installer. Initial version from Shun-ichi GOTO in BTS 449 for private copies of DLLs. Additional changes to remove local DLL flag on uninstall and set privilege level.