Remove 'source' from the FTP put condition

[nicolasCtd]

It should be possible to register an external "put" method regardless of the source file being transferred.

According to the current logic, the default "put" method must be used when:

• cpipeline is not None
• cpipeline.compress2rawftp(source) returns None.

However, compress2rawftp() does not actually use its input argument.

vortex/src/vortex/tools/compression.py

Lines 175 to 180 in d02877b

	def compress2rawftp(self, local):
	"""
	Return the name of the rawftp's specialshell that can be used to
	compress the *local* data. It might return None.
	"""
	return self._rawftp_shell

As a consequence, method.put_condition() only need cpipeline (and source can be replaced by any str value in the "put_condition" function).