files: actually filter out removed files
'hg files' makes an attempt to filter out removed files, but that doesn't work
because repo.dirstate[f] returns lowercase 'r', not uppercase.
ui: show prompt choice if input is not a tty but is forced to be interactive
The tests often set ui.interactive to control normally interactive prompts from
stdin. That gave an output where it was non-obvious what prompts got which
which response, and the output lacked the newline users would see after input.
Instead, if the input not is a tty, write the selection and a newline.
help: basic support for showing only specified topic sections
For instance, 'hg help config.files' will show only the Files section.
help: support OS-specific help sections
Containers of the form:
.. container:: verbose.<os>
are shown by default on the given OS (or with -v).
minirst: allow multiple container types for prune
If we have a container of type x.y, then we can preserve it by
keeping x or y.
config: don't read the same config file twice
In some cases some config files would be read twice and shown twice in
showconfig --debug.
templater: fix precedence of --style and --template options
Since
e3eb480a9391, --template option is ignored if --style is specified,
which is wrong according to the doc of show_changeset():
Display format will be the first non-empty hit of:
1. option 'template'
2. option 'style'
...