new function mbus_frame_direction to get the direction of a frame
(slave to master or vice versa)
extended mbus_frame_data_parse to check the direction of a frame
new function mbus_frame_direction to get the direction of a frame
(slave to master or vice versa)
Extend mbus_recv_frame with simple echo cancelation
Revert "Extend mbus_recv_frame with simple echo cancelation"

This reverts commit 169e37d360f5782dbbfe8bf9ccb5877cb6af7fb9.
Extend mbus_recv_frame with simple echo cancelation
New defines for purge behavior (echo cancelation)
Purge behavior as new context parameter (default = purge master to
slave)
Merge branch 'master' of
git+ssh://git@github.com/lategoodbye/libmbus.git

Conflicts:
	mbus/mbus-protocol-aux.c
revert last commit
handle direction of ACK correctly
Added product name mapping for Ista sensonic II mbus
Merge pull request #25 from lategoodbye/master

simple echo cancelation
New test frame for Elvaco temperature / humidity meter (from Jakob
Skov-Pedersen)
Extended mbus_data_variable_print to print out VIF/VIFE
Add VIF for digital input and output
Correct some cases
Add custom VIFE handling with a corrective factor (from Jakob
Skov-Pedersen)
Added product name mapping for Elvaco meters
Fixed potential segmentation fault
experimental command-line tool for sending raw (hex) frames to a select mbus unit
Merge pull request #26 from lategoodbye/master

Fixed parsing with custom VIFE