Create the Pgsql branch
Add headers for pgsql
Add connection to pgsql database
add two headers : Reader and Transaction provider
Add command provider header, and connection provider implementation.
Add the sql_command_provider.
add exec_command wich execute a command without checking the result.
add pgsql_reader_provider
replace ugly class by a beautifull lambda&unique_ptr
Correct some bugs. It now return correctly a result!
The library is now working :)