public utility method for local disk detection
Race condition fixed for configuration mercurial test.

*sometimes hgrc not updated before log command started
Exception in log history fixed

*do not modify external parameters!
CapturingProcessHandler changed to OsProcessHandler for mercurial command execution, possibility to close some tasks added, text for process indicator added.
Support Mac OS X 10.6+ keyboard setting "Full Keyboard Access" in sheets emulation. (after-review)
IDEA-117936 IDEA13 fails to stop at breakpoint inside advised method
public utility method for local disk detection (works on non-windows)