Orientation/Learning Documentation

The code in this pull request comprises of two parts:

1. Documentation as orientation or learning material. Some in class and class-feature note clauses and others in NOTES.txt (which--at it turns out--is not going to be my ultimate suggestion, but simply where we started).

2. Some changes I needed to get EWF to run on my local machine.

in previous feature's change, the new name was `l_message: WSF_HTML_PAGE_RESPONSE'
and `l_html_response' for `l_body_html'
Note that I agree for `l_body_html' but probably `l_message' or `l_response_message' would be better.
In any case, the same naming should be used for all the features.