Pdfslash

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**Add:**

* Add '--auto' option in 'export' command [6836c780]

* Add '_mediabox_reset' command (experimental) [8ae1e6b8]

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**Fix:**

* Fix double printouts in GUI (undo and redo) [f74f55c8]

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**Change:**

* Change and Fix box coords inconsistency [676dca64]

PyMuPDF box coords are mediabox 'top' aligned,
and the program normally used them,
while img box coords are mediabox 'top-left' aligned.

I have been using them very inconsistently.

Now, all boxes in interfaces are img box type ('top-left' aligned).

**Add:**

* Add x key for exact coords paste (GUI) [80dde8d1]

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**Change:**

* Change overwritten 'h' key to 'H' (GUI help method) [5394c9c5]

'h' is used in 'move rectangle' ('h', 'j', 'k', 'l').

Before:
h: print help in terminal

After:
H: print help in terminal

**Fix:**

* Fix `--nocheck` commandline argument (it didn't work previously) [ce1481e1]

* Fix pdf y-direction adjusting error [9e9144e6]

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* Fix a few bugs (info related)

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* Add note.rst