Update Sec7i_FLEXRamp.txt

Rewrote code for RHW-6S, 8S, 10S, and 12S Type D1 Outside Ramps and D1 Outside Wide Ramps
Added code for RHW-8S Type A1 Outside Wide Ramp
Commented out D1 code for RHW-6C, 8C, 10C