run-tests: factor out _escapepath

debugignore: normalize the file before testing dirstate._ignore() With an ignore pattern containing a '/' and a Windows style path containing '\', status was properly ignoring the file, but debugignore was stating that it wasn't ignored.

check-code: add rule to detect usage of external diff via extdiff This rule detects "hg extdiff" invocation without -p/--program and -o/--option. This patch specifies "-p diff" explicitly in test-extdiff.t to avoid false positive matching.

tests: use portable diff script via extdiff extension Before this patch, some tests using external "diff" command via extdiff extension fail on Solaris, because of incompatibility of "diff" command and its output. For example, system standard "diff" (= /usr/bin/diff) on Solaris differs from GNU diff in points below: - "-N" (treat absent files as empty) option isn't supported - files are examined not in dictionary order (maybe, in order in storage) This patch introduces portable diff script "pdiff" and make tests use it via extdiff extension. For portability of tests, this patch invokes "pdiff" script with explicit "sh", because standard shell of runtime platform ("cmd.exe" on Windows) is used at first to invoke external diff command.

test-patchbomb: ensure hg email write to stdout With -n/--test and if the PAGER environment variable is set, 'hg email' send its output to the user defined pager. If the pager capture the output, the test is unable verify it. Unsetting the PAGER environment variable force 'hg email' to write to stdout.

check-code: examine magic pattern matching against contents of a file Before this patch, check-code examines "magic" pattern (e.g. '^#!.*python') matching against not contents of a file, but name of it. This unintentionally omits code checking against Python source file, of which filename doesn't end with "*.py" or "*.cgi", even though contents of it starts with "#!/bin/python" or so. In this change, 'pre' refers contents of file 'f'.

docchecker: use indentation of 4 spaces This is fixing for 'must indent 4 spaces' check-code rule. check-code has overlooked this, because a file isn't recognized as one to be checked (this problem is fixed by subsequent patch).

docchecker: remove naked except clause This is fixing for 'naked except clause' check-code rule. check-code has overlooked this, because a file isn't recognized as one to be checked (this problem is fixed by subsequent patch).

misc: use modern exception syntax This is fixing for 'legacy exception syntax; use "as" instead of ","' check-code rule. check-code has overlooked these, because files aren't recognized as one to be checked (this problem is fixed by subsequent patch).

f: use modern octal number formatting This is fixing for 'legacy octal syntax; use "0o" prefix instead of "0"' check-code rule. check-code has overlooked this, because a file isn't recognized as one to be checked (this problem is fixed by subsequent patch).