Upgrade trac to the v 1.2

[Alex Samorukov]

Trac current is now v 1.2. To keep server secure and up to date i would recommend to migrate to it from the 1.2 version. Steps to do:

1. Try to upgrade locally, from the backup.
2. Check if custom functionality (plugins) is working. List of the plugins could be found in WIKI. Some of them do have small local modifications. Some of them probably needs to be upgraded to the latest version.
3. If upgrade works well - put server into maintenance mode and repeat steps on prod. Prepare roll back plan if everything goes wrong
4. Notify users and test all basic functionality

[Alex Samorukov]

Minor issue with out trac installation - RSS urls are not correct. To check after migration, may be will be fixed w/o additional actions

[Alex Samorukov]

Another issue: wrong author information in the svn expansions, see https://www.smartmontools.org/browser/branches/RELEASE_6_6_DRIVEDB/smartmontools/drivedb.h for the example

[Alex Samorukov]

1. Trac updated to the 1.2.2 using doc from ​https://trac.edgewall.org/wiki/TracUpgrade
2. I had to update ​trac account manager to the latest dev version, because stable is not yet supporting Trac 1.2
3. Additionally dnspython and Pygments python modules were updated
4. Plugin TracSpamFilter been updated to the latest version
5. nginx configuration been updated to match versions of the plugins

TODO: Check if ​https://trac.edgewall.org/wiki/TracUpgrade#to1.2 is relevant for us

[Alex Samorukov]

Trac upgraded, ReadonlyWikiPolicy added to the list.