#2 Finer-grained control of whitespace

[Jay Sachs]

One idea: add a <&> tag which consumes surrounding
whitespace.

Another idea: add tag "suffix", e.g. "@L", "@T", "@N", "@W" for "leading", "trailing", "none", "all", which
controls how whitespace around that tag is treated.
For example,

<%if cond @L>

will always consume preceding whitespace, but trailing whitespace is preserved. Need to determine what

<%if cond1 @T>
<%if cond2 @N>

would mean, though.