Revert "OemGatewayEmoncmsBuffer: call time() out of loop (minor)"

This reverts commit 22b6d2fe912a705d7d729b19d28815a65c3a9e7e.
Revert "OemGatewayEmoncmsBuffer: round timestamp to 0.01 s"

This reverts commit 2cddea592189355713c1233101a66c01e47de192.
Revert "OemGatewayEmoncmsBuffer: MAX_DATA_SETS_PER_POST"

This reverts commit d184d1533b364e1cb6a0a5a28d6c3f62e0b02ed4.
Revert "OemGatewayBuffer: sending period"

This reverts commit a6c75ef6e53f6698bee4e32e2954535cd2b21c64.

Conflicts:
	oemgatewaybuffer.py
Revert "OemGatewayBuffer: don't flush buffer if inactive"

This reverts commit c50c14ecd9e2a845007e988f1f4e3211a32e5276.
[Bugfix] Error introduced when git reverting