* mh-index.el (mh-index-search): Checking mh-find-path-run is

* mh-index.el (mh-index-search): Checking mh-find-path-run is
unnecessary.

* mh-init.el (mh-sys-path): Co-locate with mh-variants, which uses it.
(mh-variants): Note variable isn't meant to be accessed directly; use
function mh-variants instead.
(mh-variant-info, mh-variant-mh-info, mh-variant-mu-mh-info)
(mh-variant-nmh-info): Co-locate next to mh-variants, which uses them.
Updated to use mh-file-command-p which is more accurrate than
file-executable-p which returns t for directories.
(mh-file-command-p): Move here from mh-utils, since mh-variant-*-info
are the only functions to use it.
(mh-variant-set, mh-variant-set-variant, mh-variant-p): Use function
mh-variants instead of variable. More robust.
(mh-find-path-run): Move here from mh-utils.el. Mention that checking
this variable is unnecessary.
(mh-find-path): Move here from mh-utils.el. With the advent of MH
variants and an mhparam command that doesn't work if there isn't an MH
profile, we can't get libdir for running install-mh. So don't bother.
If there's an issue with the environment, direct the user to install
MH and run install-mh (closes SF #835192). Don't read ~/.mh_profile
directly. Use mh-profile-component which uses mhparam (closes SF
#1016027).

* mh-utils.el (mh-get-profile-field): Rename to
mh-profile-component-value. Add colon to search removing unnecessary
addition of colon to field in mh-profile-component.
(mh-profile-component): Modify call to mh-profile-component-value
accordingly. Move next to mh-profile-component-value.
(mh-find-path-run, mh-find-path, mh-file-command-p): Move to
mh-init.el. It makes sense that code that is only run once per session
(more or less) is in mh-init.el rather than cluttering mh-utils.el.
(mh-no-install, mh-install): Delete.