bugzilla: fix section reading

templater: use new config parser This gives us the ability to use includes and continuations

config: add section filter to read move section filtering out of ui.readconfig kill section filtering in config.update

config: deal with spaces at end of line more carefully

hgweb: kill parentui references

ui: kill most users of parentui name and arg, replace with .copy()

ui: replace parentui mechanism with repo.baseui

add cmdutil.remoteui remoteui sorts out the issues of getting ssh config options from the local repo into the remote one while not copying other options like hooks.

ui: less links to parentui

config: add some helper methods