Include regexps from base styles. Fix muse-project-ignore-regexp and use it more.

Include regexps from base styles.  Fix muse-project-ignore-regexp and use it more.

* lisp/muse-blosxom.el (muse-blosxom-get-categories): Don't include
  folders that match `muse-project-ignore-regexp'.

* lisp/muse-project.el (muse-project-ignore-regexp): Correct an escape
  omission.  Add ",.*" to list of bad directory parts.

* lisp/muse-project.el (muse-project-of-file): Ignore PATHNAME if it
  matches `muse-project-ignore-regexp'.

* lisp/muse-publish.el: Install patch from Peter K. Lee.
  (muse-style-elements-list): New function that returns a list of
  references to ELEM in STYLE, including base styles.
  (muse-publish-markup-region): Use muse-style-elements-list rather than
  muse-style-elements when getting :regexps.

* lisp/muse-publish.el (muse-style-element): Add docstring.
git-archimport-id: mwolson@gnu.org--2005/muse--main--1.0--patch-176