mutt

Doc: fix more typos

Doc: fix aspell calls, add custom mutt-only wordlist

Require already opened folder when using templates for change-folder. For example, start with -y and type a wrong IMAP password so that no mailbox is open. Trying to change folders resulted in a crash.

Clear last search pattern if it's invalid. Closes #3315. We keep both, the string version and compiled version around for search-next; however, in case of parsing errors we dropped only the compiled version and not the string one making the code attempting to perform a search using a NULL pattern.

Bail on missing pattern modifiers at end of pattern. Closes #3314.

Docs: fix typos/style

Catch SSL null prefix attach (openssl)

Add buffy_new and buffy_free abstractions.

manual: fix wrong spell checker assumptions

Manual: Fix typos, consequently use en_US spelling