Merged Rails 2.1 compatibility branch.
Fixed #1545: migration on fresh install fails (broken by r1592).
Change projects homepage limit to 255 chars (#663, #1095).
Wiki page protection (#851, patch #1146 by Mateo Murphy with slight changes).New permission added: protect wiki pages. Once a page is protected, it can be edited/renamed/deleted only by users who have this permission.
Merged Git support branch (r1200 to r1226).
Fixes migrations that change string limits for sqlite.
Allow longer version names (#711, closes #712).
Fixes migration 87 error when running MySQL with STRICT_TRANS_TABLES on (#771).
Adds an optional description to attachments.
Fixed: not null constraints not removed with Postgresql.
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