Don't include paths libraries in Python run configurations for PyCharm

This prevents adding various global Web libraries to Python path.

PyCharm doesn't have a concept of a Python module that depends on a
Python library (as opposed to IntelliJ and Jython that can depend on
Java libraries).
Cleanup
Merge branch 'python-fixes'
DomUtil.hasXml: use DomElement.exists() to avoid costly getXmlElement()
Merge remote-tracking branch 'origin/master'
[log] Fix getGraphChange() in GraphAnswer.
IDEA-122034 status command error temporary fixed

 *log.error changed to special silent notification when status command failed , because of VscUtil.getVcsRoot method specific (when there are no project directory  information vcs root for .idea internal files will be .idea dir);
 *several using of VcsUtil methods changed to HgUtil appropriate methods
default update Project strategy should be merge strategy
quick fix for EA-54736 - assert: MethodCandidateInfo.getPertinentApplicabilityLevel

(cherry picked from commit 89b7f86d000c0d1157aee93faf523732e08068ea)
new inference: reject expression constraint which leads to false inside bound set

(cherry picked from commit c730aa5485c73b3c4459f484f2dfd7bdab5cba6e)
testdata for IDEA-122074, IDEA-122084

(cherry picked from commit 582e8846460cb5f4c20d271cdf7894e557bc6e02)
new inference: resolve bounds which are not mentioned by additional constraints before starting algorithm

(cherry picked from commit f4c3b393d749a7ad27936014c932492643a277e4)
[git log] IDEA-122148 Hide action from non-git projects
Merge remote-tracking branch 'origin/master'
wizard popup positioning fix fox mac (^medvedev)
initialize compiler options before any further customizations to adapt to lazy initialization of some components inside javac (IDEA-120255)
exception handling
IDEA-121431 New Mac Messages sometimes appear in the upper left corner of the desktop for a split second
[git] IDEA-119453 IDEA-120142 Keep git error output

Git error output is written into the VcsException and is later:
* Parsed in GitCheckinEnvironment#isMergeCommit (IDEA-119453)
* And shown to the user (IDEA-120142).

This error was wrapped in 23583d3a and led to these bugs.
=> Return the original message.
style