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PIC32 USB mass storage device works; USB and MSC are now enabled by default in the PIC32MX7 MMB configuration

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Add SD card support to the PIC32MX7 MMB board; Add regiser level debug instrumentatin for the PIC32 SPI driver

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Fix return values from sleep(), usleep(), and sigtimedwait().  Fix STM32 F2 I2C bug-for-bug compatibility

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