This allows a page to have multiple placeholders, since we're no longer
tied to unique IDs.

To improve organization with the increasing number of examples, every
example page is now the index of its own subdirectory, which contains
all the files specific to that example.

git-svn-id: https://flot.googlecode.com/svn/trunk@319 1e0a6537-2640-0410-bfb7-f154510ff394

Skip loading excanvas in IE 9 in examples (thanks to Ryley Breiddal), adapt NEWS and README to mention this

git-svn-id: https://flot.googlecode.com/svn/trunk@293 1e0a6537-2640-0410-bfb7-f154510ff394

filling them, this means that an arbitrary bottom can be used
instead of just the x axis (based on patches patiently provided by
Roman V. Prikhodchenko).

New fillbetween plugin that can compute a bottom for a series from
another series, useful for filling areas between lines (see new
example percentiles.html for a use case).

More predictable handling of gaps for the stacking plugin, now all
undefined ranges are skipped.

Fixed problem with plugins adding options to the series objects.

Fixed a problem introduced in 0.6 with specifying a gradient with {
brightness: x, opacity: y }.


git-svn-id: https://flot.googlecode.com/svn/trunk@229 1e0a6537-2640-0410-bfb7-f154510ff394

Implemented plugin system, introduced experimental hooks system (three hooks defined at the moment), moved thresholding to plugin, new stack plugin for stacking charts, refactoring of data processing to support plugin writing, moved series specific global options, changed semantics of arguments to plothover event to reflect the situation with data transformations

git-svn-id: https://flot.googlecode.com/svn/trunk@157 1e0a6537-2640-0410-bfb7-f154510ff394