Display current review in "other sub-s" (#143)

If current user has a review for a submission, display its content in a
review form and disable that form.

Fixes #143
Fixing pep8 warnings.
Reduced the amount of duplicated code

part of #143.
clean toolbar.html for inline css
clean base.html and head.html for inline css
A cron job to fix parameter values' discrepancy.

Part of #136.
Merge remote-tracking branch 'upstream/master' into solvers_num
Merge remote-tracking branch 'upstream/master' into own_review
Properly handling recent attempts

when the user is not logged in.

Fixes #171.
Merge pull request #173 from egor83/master

#171 - Properly handling recent attempts when the user is not logged in.
fix indentation for the if block
Merge pull request #166 from anubhavsinha/#15-toolbar.html

clean toolbar.html for inline css
Merge pull request #169 from anubhavsinha/#15-head.html

clean base.html and head.html for inline css
Reacting to code review (#143)
Properly creating Jeeqser_Challenge

if it was requested, but did not exist.

Fixes #155.
Merge pull request #175 from egor83/155_review_exception

Properly creating Jeeqser_Challenge if it was requested, but did not exist. (#155)
has fix for #163 and clean up for file activities_list.html
Merge pull request #177 from anubhavsinha/#15_activities_list.html-has_fix_for_#163

has fix for #163 and clean up for file activities_list.html
clean up avatars.html
Merge pull request #179 from anubhavsinha/#15_avatars.html_from_merged

clean up avatars.html