Sqllex

- SearchCondition placeholder bugfix
- AbstractTable.replace bugfix
- " ' " -> " " "
- psql.midleware fix
- DEC2FLOAT, float convertion added for psql
- speed-tests remastering

- JoinType renamed to JoinMethod, added JoinArgType
- script_gens got minor update
- postgresqlx.middleware remastering
- postgresqlx placeholder bug fixed
- crop_size remastered (now it's faster)
- functools.wraps removed
- from_as_ remastered (in progress)
- types fix
- JOIN logic changed a little
- content_gen remastered
- args_parser removed from inserting stmts
- other minor fixes. Now it's a little faster and less glitchy

- Placeholders fixed
- Docstrings remastered for SQLite3x and PostgreSQLx
- Pragma methods and generators remover from ABDatabase and moved to sqlite3x dir
- Auto copy docs decorator added
- refactoring args_parser_wrapper
- tests fixed/updated
- preparing psqlx for release

- Added beta PostgreSQL support (new class PostgreSQLx)
- Updated docs-strings for many SQLite3x methods
- Imports optimisation
- Changed border symbol for tables and columns names in scripts from <'> to <"> (due to postgres support)
- New requirement "psycopg2"

- setup.py hotfix

This is the last "SQLite-only" Sqllex ORM version

With the new updates (0.2+) base logic of scripts generation will be changed. Since sqllex v0.2 output data will not be converting from (original) tuple of tuples to list of lists, it will return "as is" instead.

There is a few reasons of these changes: tuple are faster, lighter and more reasonable for use as type of static record than list. So that's why all databases drivers use tuples.

Anyway I'll leave a few tools for converting in `sqllex.other` (return2list, lister, tuple2list) to simplify the process of transition to a new sqllex versions.

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Changes:
- Removed mistaken imports and requirements