Commander: few optimizations for better user experience

[scriptum]

Here are two little changes to make commander search better:

1. Get more score for exact match. E.g. you have file named
   "editor.c" and type "edi" - editor.c going to be first. With
   current scoring system you may find "editor.c" document on 10th
   line or deeper.
2. Remove path for documents. Usually you don't want to type full
   path to file to find document in list. This makes fast document
   searching possible with fixing fixed length address bug  #1 optimization.
   

[b4n]

1. yes this is a problem, but your solution really only solves one particular case: when matching the very start of the haystack. This is rarely the case, and without your second change I can't think of any actual and convenient use case. I believe the real fix here would be to give higher weight to contiguous match (e.g abc would have a higher score against abcd ef than against a b cd ef because it matches more contiguous input on the same word).
2. Well, yes and no. Your solution will make it impossible to filter different files with the same name under different paths (e.g. two Makefiles). A better (but less trivial) solution for this would be to give higher score when the match is near the end (e.g. with parts separated with "/" or "→"), as indeed in most cases one will want to match near the end. A possible alternative workaround could be adding a new prefix to match only the basename (fb: or b: maybe).

More generally though the algorithm would benefit from being much better, like allowing garbage in the pattern and the like; but unfortunately good results seemed to mostly depend on fine tweaking.

Anyway, I tried to work on something improving first point, and although not ready yet it shows promising results.

[scriptum]

Well that worked fine for me but I'm also using Russian locale, so there are many problems with translated menu items.

Maybe I could provide better algorithm in the future.

[b4n]

I believe #154 should fix the issues you were facing, and be a generic solution to the problem.