Update MSSQLDatabaseConfigurationHelper.php

In preparation for https://github.com/silverstripe/sapphire/pull/1319
Probably should accept this at the same time.

If someone knows of the relevant ALTER permissions in MSSQL, feel free to implement.
Removing dropping of indexes, has problems with running dev/build twice
default float spec to 53 so dev/build doesn't continually show as changed

otherwise it continually shows as changed from "float(53) not null..." to
"float not null"
Revert fc3df54eaba460ab131857b5cb9a73efba16fe1c
Removing paging subset occuring before pagination is set
Merge pull request #11 from mattgunn/patch-1

Removing paging subset occuring before pagination is set
Free the result when at the end of a set using mssql drivers
BUG Fixing problem where duplicate items appear on pages

Reverts 13cdb07539d560f509605b836390de3317401fb4 and instead calls
setLimitItems(false) on PaginatedList to tell it we've already
limited the number of items to be shown.
Merge pull request #6 from ss23/patch-1

Update MSSQLDatabaseConfigurationHelper.php
Merge branch '3.0-index-fixes' of git://github.com/tractorcow/silverstripe-mssql into tractorcow-3.0-index-fixes
Upping requirements to 3.0+ in latest version of the module.
Removing redundant information from README
Updating README with more up to date instructions and requirements.
BUG: Indexes were not being fully escaped (the parent table name was, but if the relational table is also namespaced then it would trigger an error).
Merge pull request #13 from nikrolls/bug_indexes-not-fully-escaped

BUG: Indexes were not being fully escaped
API Upgraded module to use new database ORM
API Updated connector class to use new error handling code
Removed redundant parsePreparedParameters function
Reverted configuration helper to previous method of calling the connector api directly
API Tweaked error reporting code
Fixed files with typos and missing newlines at end of source code
Merged 55c56b9b665819f1c5fe4b7eaf07041950620c0e
PHPDoc and whitespace cleanup
Fix regressions / API tweaks
Manual merge of #13