context: fix call to util.safehasattr

alias: inherit command optionalrepo flag (issue3298) Commands working without a repository, like "init", are listed in commands.norepo. Commands optionally using a repository, like "showconfig", are listed in commands.optionalrepo. Command aliases were inheriting the former but not the latter.

tests: improve test of hg-ssh and make the test pass on windows

hg-ssh: exit with 255 instead of -1 on error Unix sh would cast -1 to 255 anyway, but on windows -1 become 0. Better be explicit with the 255 everywhere.

hg-ssh: use %s for printing paths in error messages This avoids \\ if this ever is run on windows - for example in the test suite.

tests: accept \ in test-casefolding on windows

parsers: statically initializing tp_new to PyType_GenericNew is not portable As detailed on http://docs.python.org/extending/newtypes.html (quote): "In this case, we can just use the default implementation provided by the API function PyType_GenericNew(). We’d like to just assign this to the tp_new slot, but we can’t, for portability sake. On some platforms or compilers, we can’t statically initialize a structure member with a function defined in another C module, so, instead, we’ll assign the tp_new slot in the module initialization function just before calling PyType_Ready()." Fixes "gcc (GCC) 3.4.5 (mingw-vista special r3)" complaining with: mercurial/parsers.c:1096: error: initializer element is not constant mercurial/parsers.c:1096: error: (near initialization for `indexType.tp_new')

merge with stable

context: add copies method with caching

filectx: handle some other simple cases for finding merge ancestor