Fix issues with output configuration GUI

Make it possible to reset if setting leads to an exception, check for
empty values, set temp configuration so expert settings stays happy.

Bug 881
Added instructions to make sure correct branch is used when building usersguide

Ticket: 891
Usersguide: Fixed parameter exploration vtl links

docs/usersguide/parameter_exploration.rst:
  Custom link names should end with '.vt' not '.vtl'
Added instructions to make sure correct branch is used when building usersguide

Ticket: 891
Usersguide: Fixed parameter exploration vtl links

docs/usersguide/parameter_exploration.rst:
  Custom link names should end with '.vt' not '.vtl'
Improve initialization exception messages

traceback.print_exc takes file as its 2nd arg, and
format_final_exc_line includes its own newline.
Fixes UnboundLocalError in Package#dependencies()
Fixed parameter exploration dates not saved in vistrail

Also fixed comparing PE:s.
A new version was always created on execution because
they were always considered different.

core/paramexplore/paramexplore.py
  Added __ne__ and removed real_id comparison

db/specs/all.xml:
  Added missing parameter exploration date in xml

Fixed PE date format in:
gui/paramexplore/pe_inspector.py
gui/paramexplore/pe_table.py
core/collection/parameter_exploration.py:

Regenerated:
db/versions/v1_0_3/persistence/xml/auto_gen.py
db/versions/v1_0_3/schemas/xml/vistrail.xsd
db/versions/v1_0_3/specs/all.xml

Bugfix: Could not load saved Parameter Explorations
Bugfix: New Parameter Exploration was created for each execution
Fixed TestParameterExploration.testComparisonOperator

core/paramexplore/paramexplore.py
Removes last traces of .vistrails/startup.py
Fixes other warnings in startup.py
Merge branch 'removes-startup-py' into 'master'
Merge branch 'v2.1'

Also adds missing date to 1.0.4 schema

Conflicts:
	vistrails/db/versions/v1_0_3/persistence/xml/auto_gen.py
	vistrails/gui/paramexplore/pe_table.py
Fixed vtl:s without version not working

core/db/locator.py:
  - guess_extension_from_contents:
    int conversion need to check for TypeError
Added info on saving parameter explorations

doc/usersguide/parameter_exploration.rst:
  Added Saving parameter explorations chapter

doc/usersguide/figures/parameter_exploration/inspector.png: *new
Merge branch 'v2.1'
Passes sys.argv to QApplication() again

Ticket: 889