Database overhaul, fixes for feedback and assessment

1. Database overhaul (see below)

2. Fixes for feedback (support feedback added back in after multiple incorrect submission attempts)

3. Fixes for assessment (each punctuation mark is checked, so multiple can be wrong simultaneously, though only one HP is deduced each incorrect submission attempt)

4. Visual fixes (some crowded sentences spaced out better)

*database details:

New columns (all columns included for each sentence submission):

var url = 'http://syntence.pythonanywhere.com/test/sentence/'

+ _structure

+ '/' + _username

+ '/' + _attempts

+ '/' + _punct1

+ '/' + _punct2

+ '/' + _punct3

+ '/' + _time

+ '/' + _map

+ '/' + _togglesupport

+ '/' + _p1comma

+ '/' + _p1semicolon

+ '/' + _p1colon

+ '/' + _p1dash

+ '/' + _p2comma

+ '/' + _p2semicolon

+ '/' + _p2colon

+ '/' + _p2dash

+ '/' + _p3comma

+ '/' + _p3semicolon

+ '/' + _p3colon

+ '/' + _p3dash

+ '/' + _hintTogether

+ '/' + _hintDash

+ '/' + _hintColonVsDash

+ '/' + _hintSemicolon

+ '/' + _hintSemicolonVsColon

+ '/' + _supportSemicolon

+ '/' + _supportParenD

+ '/' + _supportParenI

+ '/' + _supportListD

+ '/' + _supportListI

+ '/' + _supportColonD

+ '/' + _supportColonI

+ '/' + _supportDash

+ '/' + _hp

+ '/' + _ammo

+ '/' + _commaLevel

+ '/' + _semicolonLevel

+ '/' + _colonLevel

+ '/' + _dashLevel

+ '/' + _parenLevel

+ '/' + _dependenceLevel;