- created i2c_slave_pkg file with constant defs
- added blinking of I2C LED in top-level file
- pulse generation now according to specification

Also started making changes to release top file
following discussion with Erik.

Also deleted old_rep_test folder and recompiled (and tested)

I2C slave working, with ELMA protocol on top. Submitting last changes + doc for I2C slave. Also updated order-record doc

Basic functionality with immunity to no input channel while in INV-TTL mode and documentation update.

Basic pulse repetition operational. Folder structure pretty much the same as before, but pulse repetition files exist in <pulse_generator> folder. <release> folder holds release version for the firmware.

Added old repeater boards' test. New project folder hierarchy started, as exemplified in old_rep_test/ folder.