hgk: in popups, replace labels with window titles Replace labels with window titles. That also requires to change grid placement manager settings to compensate padding which used to be applied to now non-existent labels.

hgk: update backgroud colour when Ttk is available Ttk doesn't automatically set up Tk colour palette. Because of that, Ttk controls look differently when used together with old Tk controls. When we use Ttk controls, we first query if we have any setting for the client background, and if we do, we update Tk palette as well.

hgk: fix pop-up windows Create pop-up windows properly so they go to the floating layer in tiling window managers.

hgk: don't use fixed format for dates Don't pass -format with a date format string, use default instead so users can use their own preferences.

hgk: reformat changsets fields Rename Author to User. Rename Revision to Changeset. Put Date on its own line.

hgk: drop committer field from the UI Remove Committer field, it doesn't make sense in Hg.

test-completion: test completion of tags

debugpathcomplete: satisfy the code checker

tests: test debugpathcomplete and debuglabelcomplete

tests: rename test-debugcomplete.t to test-completion.t