ui: add prompt argument to write (issue5154) (API) When code like filemerge._iprompt calls ui.prompt, it expects the user to see the output in addition to getting the prompt. Other code such as histedit may call ui.pushbuffer, but its goal is not to interfere with prompts, so this commit adds an optional prompt flag to ui.write and has _readline include that argument. ui.promptchoice calls ui.prompt which calls ui._readline. This commit also updates hgext.color.write.

hg: perform update after pulling during clone with share (issue5103) This is a graft of 60adda1a0188 and a4692267bc2d from the default branch. Combined, they address a bug with pooled shared storage where an update may not update to the most recent revision when performing a `hg clone`. The patches should have been written against the stable branch in the beginning. I screwed up.

tests: fix failure of test-convert-mtn.t This is follow up for 3f9e25a42e69, which overlooked this test.

templater: relax unquotestring() to fall back to bare string This is convenient for our use case where quotes are optional except in a map file.

debugrevspec: show expanded/concatenated states before printing trees The debugrevspec command prints at most 4 parsed trees. It wasn't easy to tell which tree belongs to which state.

templater: do not abuse SyntaxError to report errors in template map file SyntaxError is the class representing syntax errors in Python code. We should use a dedicated exception class for our needs. With this change, unnecessary re-wrapping of SyntaxError can be eliminated.