files: correct topic of formatter

revert: move targetsubs calculation down to its use A future patch will be reorganizing this section of the code into two paths, and targetsubs complicates this by existing in the middle of one path, but not the other. We fix that by moving it 200 lines down, to the only place it's used.

help: document that default hgweb style is called paper (issue4373)

help: update help for hgweb template and style (issue4373)

bundle2: rename functions that have the same name

mq: write headers of new patches using patchheader

mq: refactor patchheader header ordering to match export (BC) The refactoring also gives more robust and extendable handling of other HG headers.

mq: upgrade non-plain patches to HG format when setting parent in patchheader Parent will now always be updated or added when qrefreshing HG patches. Plain patches will not be changed, but patches that neither are plain nor HG will be upgraded to HG patches on first refresh.

mq: make patchheader .plainmode more reliable Instead of having to make extra checks whenever we use .plainmode, let the initial value consider the actual patch header content.

bundle2: remove heads and common arguments to getbundle parts generators