This is a exception to be thrown when the error occures because
of bad user data. We don't want to print a full stack trace in
these cases but just tell the user what went wrong.
The new functions always creates normal and partitioned functions.
Also adds specialised connection and cursor classes for adding
frequently used helper functions.
Given that only one command will be executed in the end, it is
not necessary to import what amounts to the whole library. This
becomes in particular important for update functions that have
a dependency on pyosmium. The dependency can remain optional for
people not using updates.
The PHP scripts need to know the position of the nominatim
tool in order to call it. This is handed in as environment
variable, so it can be set by the Python script.
Adds infrastructure for calling the legacy PHP scripts. As the
CONST_* values cannot be set from the python script, hand the values
in via secret environment variables instead. These are all
temporary hacks for the transition phase to python code.
