[epic] A new design for the protoboard

[sporniket]

• A longer protoboard : 80 rows, organized as a group of 55 rows and one of 25, with the option to cut the board between them
• A wider protoboard : each lanes is made of 7 holes
• One lane is bussed, i.e there is 7 lines, to accomodate e.g. I2C and SPI devices
• For each bus line, the white silk screen line that visualize it can be colored with a permanent colored felt pen
• For each bus line, the white silk screen will provide an area to write a label
• Nice to have : the silkscreen is made the same on the top side and bottom side, allowing the maker to choose its orientation.