Fixes

[PHaroZ]

I've done some fixes and improvements :

• escape all columns name in create table : instead of list reserved keyword for colum name all name are protected in CREATE TABLE
• support create table inherits : see https://www.postgresql.org/docs/9.1/ddl-inherit.html for more details
• allow varchar & char to have up to 65000 chars : in the current version char & varchar are converted to text if there size exceed 255, there is no reason to do so
• add the ability to ignore INDEX : an env variable PG2MYSQL_IGNORE_INDEX could be set to ignore ALTER TABLE ... ADD INDEX