Check that images have valid dimensions (issue 4575)
Fix special powers add-on for firefox.
Creates make.js code to build jsdoc.
Refactoring - remove duplicated code in TextLayerBuilder
Merge pull request #4618 from Schibum/text_layer_cleanup

Refactoring - remove duplicated code in TextLayerBuilder
Merge pull request #4616 from yurydelendik/jsdoc

Creates make.js code to build jsdoc.
Refactors buildImage to use Promise; don't draw bad images
Merge pull request #4613 from yurydelendik/buildImagePromise

Refactors buildImage to use Promise; don't draw bad images
Merge pull request #4581 from Snuffleupagus/issue-4575

Check that images have valid dimensions (issue 4575)
Setting empty tooltips for zoom select box items
Merge pull request #4621 from timvandermeij/tooltip

Setting empty tooltips for zoom select box items
version 1.0.21
Ensure that the errorWrapper is closed when a new document is opened (issue 4625)
Removes reference to the Makefile
Merge pull request #4628 from Snuffleupagus/issue-4625

Ensure that the errorWrapper is closed when a new document is opened (issue 4625)
Remove unused (local) variables in web/
Remove some unused variables from src/

Only obviously useless, local variables have been removed.
Merge pull request #4622 from yurydelendik/release1.0.21

version 1.0.21
Merge pull request #4607 from Rob--W/unused-vars-1

Remove a bunch of unused local variables from web/ and src/
Less copying in the JPX coder, merged and rebased