Generating Ada: Autoincrement Fields for sqlite

[fdesp87]

Autoincrement fields in sqlite are implemented as 64-bit signed integer (see https://www.sqlite.org/autoinc.html) and automatically are primary keys (different from Postgresql where autoincrement fields are not automatically primary key).

They are mapped in the schema to Integer Autoincrement Primary Key (see gnatcoll-sql-sqlite-builder.adb around line 1155), which is correct.

However they are mapped later to Ada Integer instead of Ada Long_Long_Integer. Also in gantcoll-sql-inspec.ads, this has to be changed having its Field_Mapping changed to SQL_Field_Bigint.

For more explanations, you can read the report
https://github.com/fdesp87/gnatcoll-db/examples/mytests/Report.odt