Raise error in _getobcontext if request.steps is len(0)... if someone deletes the root index_html, they will no longer get a puzzling failure if they attempt to view an object without an acquirable index_html.

Fix reference to local variable; also submitting patch to Steve Purcell.

Changed product init code so that README.txt can be any of "README.txt", "README.TXT" or "readme.txt".

we can rerun the tests and catch exceptions witha debugger.

declarations.

namespace declaration.

- Only minimize empty elements when the content model is empty,
  keeping an explicit list of which elements have an empty content
  model (e.g. <img>, etc.).  This checks whether the tagname is in an
  explicit list of such elements; the check is case insensitive.

- Minimize certain attributes that are considered Boolean by HTML,
  e.g. ismap.  Again, this does a case-insensitive check whether the
  attribute name is in a list of known Boolean attributes.

Note: this should really be refactored, making HTML support a subclass
rather than a keyword argument.  Later...

- metal to do macro expansion (default on)

- tal to do TAL expansion (default on)

- html for XHTML heuristics (default off).  See
  http://www.w3.org/TR/xhtml1/#guidelines for what this should do;
  currently all it does is to suppress the XML declaration and insert
  a space before the /> in minimized elements.

Changed the TALCompiler class to generate enough code to be able to
implement the tal=0 and metal=0 options to TALInterpreter; this meant
e.g. compiling the original contents of nodes subject to replacement.

TALVisitor.  Also added wrap=0 to the TALInterpreter call, so the
regression test isn't affected by the new wrapping code.

aligns them with the end of the tag.  This required introducing
self.write_stream() which keeps track of the current output column.

The default wrap column is 60.  Specifying 0 disables wrapping (good
for the regression test).

preserved.

them froM TALVisitor into the other modules.

class constructor, so a caller can pass in an expression compiler.
Every expression occurring in the syntax is compiled first (even the
macro name in use-macro; but not slot names, nor the macro name in
define-macro).  If the expressionCompiler argument is left
unspecified, a default compiler is chosen whose compiled output is
identical to its input.

  value.  This affects TALCompiler.py and TALInterpreter.py, and
  affects the output of the non-local-macro expansion tests.  The
  TALVisitor.py module is *not* yet fixed to do this.

- In order to do this, I had to change the "program code" format for
  the attribute list: the 3rd item of an attribute description tuple,
  if present, now names an action, and the remaining tuple items are
  arguments for that action.  Two actions are recognized: "replace"
  replaces the attribute with the outcome of evaluating the expression
  given by the next tuple  item; "macroHack" replaces the attribute
  name with "use-macro" and its value with the current macro, but
  only if we're inside macro expansion and the attribute name ends in
  ":define-macro".

- The test suite is now error-free for "./runtest.py -c" but shows some
  errors for "./runtest.py".

- Added a primitive debugging flag to the TALInterpreter class.

- Update the README.

- Should I check for spurious TAL attributes even when doing just
  METAL (macro) expansion?

- Should I turn all the other errors into exceptions too?  (Currently
  they are all print statements.)

lock-refresh request.