Revert "major improvement of shoulder flexion and shoulder extension level3 and above exercise algorithm"

This reverts commit f8767d39986247577034174234ea4a58d5deb28d.

Conflicts:
	rehabclient/filter.c
Revert f8767d3..2e77db1

This rolls back to commit f8767d39986247577034174234ea4a58d5deb28d.
Bluetooth speed optimisation ongoing