html generator

[Peter Johansson]

A function like: void html(istream&, ostream&, char delim='\n')

The function parses through the istream until delim is found. For most characters the character is copied into ostream. However, some exceptions which include:

" becomes \"

\n becomes <br/>

< becomes &lt;

becomes &gt;

& becomes &amp;

\t becomes &nbsp; &nbsp; (or should we follow the more standard of four spaces for a tab?)

This is needed for ref #62.

[Peter Johansson]

(In [178]) fixes #77 text to html translator