Bindings for python <2.5

[etiennebr]

When you import liblas in python <2.5, you get an error :

>>>import liblas
Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
ImportError: dynamic module does not define init function (initliblas)

Hobu : «This is because Python < 2.5 used to attempt to import DLLs with the extension .dll before looking for .py files or .pyd. Python >= 2.5 won't even import a .dll anymore, and will only import .pyd for extension modules. Because the dll is named liblas.dll now (we no longer put the version name in the dll), and it is in a PATH location, Python 2.4 is trying to import it before importing the ctypes module [...] I will have to think about where we can place the DLL so it doesn't end up on a Python search path.»

[hobu]

Fixed in r874. We'll use liblas1.dll for the filename, and Python < 2.5 will no longer be confused.