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* colorized-man-pages: Added hooks for commands dman and debman

`dman` and `debman` are tools from the package `debian-goodies` for
Debian systems (see https://packages.debian.org/stable/debian-goodies

).
They can display man pages from manpages.debian.org or local debian
packages respectively.

README of the plugin is also updated.

* Simplify syntax for future changes

* Fix README syntax
Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Invoke `env` via `command` to ignore shell functions and aliases.

This allows you to use `colored git log --help` for example, to get
colored output.

Resolves: #6237

Commit 09d2a597 introduced the bug, which is due to using
single brackets conditions at the same time as *.

This commit should fix it and use double brackets everywhere
else.

Fixes #4699

Some environments (in my case, cygwin) have PATH variables with directories
with spaces in them, breaking colored-man.
Adding quotes around the PATH environment variable makes the plugin run OK.