Notebook bugs for bug day 12

I have put a bundle against 3.0.1 of everything below here:

• http://sage.math.washington.edu/home/was/patches/bugday12.hg

Here's the changelog in the bundle, which gives the dependencies...

Here are the issues:

• (done; invalid) #245: [kitchen sink a bunch of random notebook improvement ideas]

• (done; needs nontrivial review) #336 Create an option to clear all cell output

• (done; needs easy review) #2636: #2636: changing a cell without evaluate should put the red line back to the left

• (done; already fixed a while ago) #408: Notebook glitch in Safari

• (done; patch ready for review) #1230: Quit worksheet behaviour

• (done; already done before) #1351: notebook -- for person users admin is usually the only user -- in such ...

• (done; needs trivial review) #1557: notebook -- usability improvement after uploading file

• (closed; can't replicate anymore) #2605: Notebook tab-backspace-(shift enter) gives bug

• (done; important significant patch) #406: notebook -- improve support for other system modes

• (done; fixed; easy to referee) #1733: notebook bug -- %foo (or anything else) in a cell by itself (with nothing ...

• (done; dupe of #336) #2118 "Delete all output" function on notebook (dup of #336?)

• (done; with patch now) #3008: first cell in notebook is undeletable

• (done; easy) #3136: the readme for osx should be changed to delete the line about inotebook()

• (done; patch posted) #3053: notebook -- new cell_resize doesn't respect %hide at the beginning of a ...

• (done with help from jason grout) Finalize #3121

• (done; patch that needs review) #637: notebook improvement -- upload allow txt worksheets.

• (closed as invalid since NOBODY else observed the same thing, so it's unfixable by anybody by Jaap) #2935: notebook: internal server error sage-3.0.alpha5 (possibly close as invalid)

• (patch posted; needs review) #2992: notebook -- help(foo) in the notebook should not word wrap

• #1498: notebook -- bug in keeping track of date of last edit of worksheets maybe

• (closed as invalid; new ticket opened for "delete published worksheets" enhancement item) #1751: Notebook revision information leakage

• (done; with easy to referee patch) #1864: simple notebook bug -- typing ? in a comment yields introspection but ...

• (done; fixed a few weeks ago as part of js.py cleanup) #1865: notebook -- after restart output of first evaluation is not displayed (I think I already fixed this!)

• (done; very easy patch) #1892: notebook -- uploading a data file should give some help about the DATA ...

• (done; turns out to be already fixed) #2496: bug in introspection (probably easy to fix)

• (done; closed since it seems to be fixed and is impossible to replicate) #2278 notebook -- when uploading a new worksheet be sure to set the permissions

• (done; yi's advice worked well; plus a bonus of fixing "control-c twice to quit") #2359: notebook -- make it so when you send a kill signal to the notebook server ...

• (done; patch posted awaiting review) #2860: #2860: easy-to-fix bug in html.py

• (done; it's a dupe) #3147: "Quit Worksheet" in notebook doesn't seem to work anymore

• (done; interesting but easy patch) #3024: notebook -- parses tracebacks in the output of docstrings of help command (see #2992 below also)

• (done; seems completely invalid. I shouldn't have reported this in the first place without checking it) #3139: typos in notebook tutorial in typesetting of sage_notebook

• (done; a surprisingly easy 1-liner that stumped me for a while) #2884: notebook -- bug; @interact cell eval doesn't clear out the old html output ...

• (done; surprisingly easy to fix) #3069: notebook -- typeset checkbox doesn't work after save/reload

• (done; it works) #2926: [with patch; needs review notebook -- Minimalistic change password page ...(referee this patch)]