Andreas Specovius / gammalib

Add GChatter argument to print() method.

The print() method now takes an argument of type GChatter to control the chattiness of the output in a homogenous manner.
Pass NORMAL chatter level in __str__ method.
Add chatter argument to print() methods.
Use GLog::chatter() method to control the chattiness of the log stream operator.
Add chatter() methods and provide member access through const references.
Add chatter() methods, provide member access through const references, and declare one liners as inline methods.

The chatter() methods control the new m_chatter attribute that is used to control the chattiness of the object's print() methods.
name() and version() methods return const references.
logFileOpen() method now sets the chattiness from the applications's chatter parameter, and name() and version() methods now return a const reference.

The use of the new GUrl class insread of the FILE type allows now for transparent input and output of an XML document in different URL types. So far only the file type URL exists (GUrlFile), but this can now easily be expanded to support piping into a string or direct http transfer. The latter is particularily useful for XML-RPC implementation.