[ShopSuite-dev] fixed ShopDB::login

[Tomasz Wegrzanowski]

login contained nasty bug: c++ string class function data() returned
internal char *, but it didn't have to be NULL-terminated.
It was responsible for nasty bugs like:
        Can't log in to the data base: ERROR: Missing '=' after so8859-14' in 
conninfo

I changed login() to use asprintf instead of c++ string class for
creating `char *dbstring'.

this version is also smaller that previous one.

shopDB.cpp
Description: Text Data