Support for STM32L1 medium-plus chips with chip id 0x427

    -Changed the STM32L1 "medium plus" (id 0x436) support to be called HIGH.
    -Added the device id 0x427 and call it medium plus.
    -Gave the loader more time so it stopped timing out and thinking it failed.
    -Added st-term to .gitignore
Note:  ST seems to call some chips with 436 medium plus and some high.  It seemed
easier to name 436 high and 427 medium plus.