Bug fixes

- fixed a bug in display of PGA devices in web status page
Akbash was limiting number of devices to GPU limit, which is 16
instead of PGA limit of 128
- fixed problem with restarts due to disabled devices
- fixed a bug in remote restart logic
- added hardware errors, accepted and ratio of hardware errors as
a ratio of hw errors to accepted count.  Both email and status web page
have this new statistics
- removed efficiency (e:) from the status page, replaced with
hw/accepted percentage