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Made acceptance of sdos based on EDS and more lenient as a result. Need to reconcile this with p3-19

Since error reset is logged, increment log list.

Fix emcy error logging

This adds error reset and other xx00h errors to the log list.
Clearing the active list once error reset is received still holds true but all errors are now logged.

Add tell() method
Use struct.pack_into for slightly better performance

Fixes #37

Related to issue #8

Fixes #38

Fixes #37

Add short example for SYNC

Add some more PDO examples in README

Closes #36

Use bytearray instead of list for messages
time module not used
Fix documentation for some methods
Minor unpacking optimizations

LSS Master

Start sending some abort codes from client on errors
Add block transfer to docs

Return None if data could not be sent
Add debug messages
Add some block transfer abort codes

Addresses part of issue #14.