ERT-518: Added function to get the mount point (i.e. ENSPATH) for the current ERT instance.
ERT-518: Renamed method in fs_manager: getFileSystem() -> getCurrentFS().
ERT-518: Upadated enkf_fs test to use testarea.
ERT-518: Pure reformatting: removed comments and reordered some methods.
ERT-518: Added testing of function enkf_fs_exists().
ERT-518: Added enkf_fs create functionality in Python object.
ERT-518: Added (dangerous) method dropCPointer.
ERT-518: Added enkf_fs_type_enum
ERT-518: Added call to umount the fs manager when going out of scope.
ERT-518: Changed the EnkfFSManager significantly:
1) The manager can now only hold a finite number of fs instances; when more instances are added the least recently used will rotate out.
2) The EnkfFsmanager will now call EnKFFS directly to mount filesystems instead of going through the enkf_main_mount_alt_filesystem() function.