[vcs-log] assertions for EDT IDEA-133449
[vcs-log] remember MoreCommitsRequests if data pack is null; call them in EDT when it is not null
[vcs-log] code issues: removed unneeded invokeLater, inline one-line method
[vcs-log] do not display root filter when not multiple roots IDEA-75093
[vcs-log] allow many roots displayed in Paths popup IDEA-75093
[vcs-log] try to improve root colors (at least extra roots are not white anymore) IDEA-75093
[vcs-log] add hide link to hide scary branches in details IDEA-133968