Check bufnr and bufname before closing

Refs #335
Reset 'cscopetag' temporarily while using `:tag`

Refs #235
Run :tag as if typed

Refs #339
The message can be useful
Version 1.79
Simplify the filtering
Update readme.md
Call s:Close() directly
Ignore ignored cwd
Specify the license

Closes #379
Revert "Move the completion function"

This reverts commit 3c6182371db8e8ede3789d21b52386569eda2208.

Revert "Use a custom completion function"

This reverts commit bedfa3b6c3badc4fa6b734098fb9b89972cdf894.
Non-subdir completion for in-prompt cd

Refs #346
Apply mruf_relative to the raw list

Closes #329
Closes #383
Include [No Name] buffers

Closes #295
Keep the deftxt string as-is
Combine the match_window options and allow more flexibility.

Closes #306
Add to the overview the buffertag mode options
Inclusion filtering for cache files deletion
Allow x_func function arguments to be passed in a Dictionary
Allow :CtrlPLine to take a bufname argument

Closes #396