BFGMiner 3.5.1 released

[Luke-Jr]

NEW VERSION 3.5.1, NOVEMBER 7 2013

Human readable changelog:
- Bug fixes only.

Full changelog:
- Bugfix: make-release: Add README.GPU document
- Demote USB string fetch failure to LOG_DEBUG since it is rather common
- Bugfix: RPC: devscan shouldn't be available to read-only access
- Bugfix: bigpic: Ignore the bitfury chip's counter as best we can
- Bugfix: bigpic: Accept other delimiters in Bitfury BF1 product string in
  autodetection
- Bugfix: Fix VCOM/fpgautils build check
- Bugfix: Only include VCOM code when VCOM/fpgautils support is being built
- Bugfix: Reimplement scan-serial "all" keyword
- Bugfix: bitforce detect: Close device after ZGX failure
- Bugfix: Define lowl_usb even if libusb support is omitted, since VCOM and
  HID drivers check against it for warnings

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