Proposing changes to alex.utils & cleaning up.

[ticcky]

I went through alex.utils, deleted some obviously unused code and marked some changes that I would like to make to improve Alex's codebase. Please let me know what you think of them.

Please do NOT merge this pull request. It is only proposal for changes.

Thanks!

[landscape-bot]

Repository health increased by 0.01% when pulling dbe2e14 on cleanup into 06a0695 on master.

• 5 new problems were found (including 0 errors and 5 code smells).
• 20 problems were fixed (including 11 errors and 6 code smells).

[tuetschek]

I'd rather keep the old name – I think it describes the function sufficiently and the new one makes lines too long ;-).

[ticcky]

The problem is that I had to study the code of the method to understand what is it doing - it was not apparent to me on the first sight it is working on a list. So how about list_remove_dups_stable ?

[tuetschek]

Oh, I've just realized that I wrote this function... maybe that's why it seemed so clear to me 😄 . So I'm probably not the right one to judge... remove_list_dups_stable would sound slightly better to me, but i'm OK with both.

[oplatek]

Proposed new change:
Replace our Counter class with stdlib collections.Counter
at file:
https://github.com/UFAL-DSG/alex/blob/cleanup/alex/utils/cache.py#L23