pkgutil.get_loader was deprecated in Python 3.12 and removed in 3.14,
so importing postgresql.python.command (and with it pg_python) fails
with ImportError on 3.14. Resolve the loader with
importlib.util.find_spec instead, which is available on every
supported version.

project.py no longer defines author or date, so the combined import
from .project raised ImportError after binding version and before
__version__ was assigned. The error was swallowed, leaving the package
without __version__ and breaking "from postgresql import *" (__all__
lists __author__ and __date__) and postgresql.bin.pg_dotconf, which
does "from .. import __version__".

Import only version_info and version, assign __version__ outside the
try, and drop __author__ and __date__ from __all__.

The settings-file loop referenced the undefined names comment and
unquote (NameError) instead of configfile.comment and
configfile.unquote, and it tested the first character of the key
rather than the text before it, so commented-out settings in the file
would have been applied. Check line[:start], as alter_config() does.

…util-get-loader-for-3-14

- Correct bit rot from a code move in pg_dotconf. (-f settings copies were broken for some time)
- Update module loader (-m) in pg_python for 3.14 and beyond. (Use importlib.util.find_spec)
- Correct data imports from postgresql.project in postgresql.__init__. (versions)