Clarify priority/order of mc.ext conflicting entries.

[gavenkoa]

I already report related bugs #2773 and #2772 but now want that team make clear statement in docs (guaranty) about priority of mc.ext conflicting entries.

I use system (Debian) mc.ext with personal tweaks:

  $ cat /etc/mc/mc.ext $skel/.config/mc/mc.ext > ~/.config/mc/mc.ext

After experimenting I found that last entry have priority over upper.

But there are no any guaranties in docs or MC Trac.

About same keyword:

shell/.doc
  Open=echo SHELL 111
shell/.doc
  Open=echo SHELL 222

or about different keywords:

shell/.doc
  Open=echo SHELL
regex/\.[dD][oO][cC]$
  Open=echo REGEX

or about include priority:

include/funny
  Open=echo FUNNY pre 111
shell/.fun
  Include=funny
include/funny
  Open=echo FUNNY post 222
include/funny
  Open=echo FUNNY post 333

or about merge of options:

shell/.doc
  Open=echo OPEN
shell/.doc
  View=echo VIEW

[gavenkoa]

Also interesting case:

shell/.doc
  Open=echo OPEN 111
  Open=echo OPEN 222

[andrew_b]

Done in [d9eeec9a5a74cae570992e9665eea7dd5ae7a98b].

See the comments in mc.ext.ini:

Sections are processed from top to bottom, thus the order is important.
If there are more than one sections with the same name in this file, the first
section will be used.

If there are more than one keys with the same name in a section, the last key will be used.

[andrew_b]

The comment above was fixed in [75577b66a726448e742966c3a833d3095e4fefb4].