Tidy comments

Squashed commit of the following:

commit 8d8a0d9713d4614b22f06fda4cf948d4d5561de0
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Tue Dec 2 17:15:42 2014 +0000

    Revert fixes to libraries

    I'll fix those at the source, where possible.

commit 5dde94e3e60dcc622d5b782acaa62e590c62bafb
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Tue Dec 2 16:57:32 2014 +0000

    Add apostrophes

commit b27e168b58861f1ad0ca7af1c6ca1629cc6730ce
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Mon Dec 1 16:28:58 2014 +0000

    Fix some more word duplication

    I've left some instances of " in in " in, as they're ambiguous and
    may actually be correct.

commit a3dfd10cd501c3a521010942f950f5ca2c5395a7
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Mon Dec 1 10:35:03 2014 +0000

    Fix another typo

commit 01a3702209d9e880ac8f60dc4d74f26d426234fb
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Mon Dec 1 10:33:57 2014 +0000

    Fix more typos

commit 56c6fffd8769cdfab62c59c04d41b98b7f425262
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Mon Dec 1 10:30:19 2014 +0000

    Hopefully fix typos

    I'm not entirely sure about src/mame/drivers/nova2001.c line 933,
    as it could plausibly be either "which is not the top bit" or "which
    is now the top bit", with almost opposite meaning.

commit 906507b221de0175d236e252dc51f122cb56db23
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Mon Dec 1 08:39:55 2014 +0000

    Fix another typo

commit 14fcd939ae1c0570c10aacf00c6ea86724086f92
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Mon Dec 1 08:38:16 2014 +0000

    Fix some more word doubling in comments

commit d21283a447b94b28a38ec742a09fe425d77b55b2
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Sun Nov 30 23:06:07 2014 +0000

    Fix some more typos

commit 59b14d204af6d5983ea6dea2f5c8ad5bcc80460c
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Sun Nov 30 22:56:53 2014 +0000

    Tidy more

commit 9b3c9a868596c04c1a61b35aa8c96fb82c885149
Author: Zoë Blade <zoe@bytenoise.co.uk>
Date:   Sun Nov 30 22:43:30 2014 +0000

    Tidy more comments