Add updated DOC files.

Merge branch 'develop': Fix #375, fix #274, fix #373.

Merge pull request #365 from joan2937/v77-release

V77 release

Merge pull request #345 from joan2937/release-v76

Release v76

Merge pull request #333 from joan2937/Release-v75

Release v75

Merge pull request #321 from joan2937/Release-v74

Release v74: closes #274, closes #298, closes #266, closes #316, closes #223.

V73: I2C_SLOTS to 512 (from 64)