* mu-str: simplify, cleanup string pre-processing functions
* some cleanups
* mu-msg-fields.[ch]: cleanup a bit
* cosmetic
* lib: updates for mu-msg-field / mu-str updates
* update unit tests
* mu4e-actions: mu4e-action-capture-message should not be interactive
* cosmetics
* lib: fix list parsing
* fix a few compiler warnings
* fix list parsing
* mu4e: update docs a bit
* mu4e: add some more quoting to commands
* cosmetics
* lib: cleanup header fields a bit more; fixes #209
* the query parser update (few commits back) fixes #210 too, this is unit test for it.
* guile: update guile tests for slightly updated testcases
* lib: fix body layout
* cosmetic
* handle invalid utf8; fixes #211 (hopefully)