add comments, clean some stuff up, gas optimisations #307
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Motivations:
Pickup some low hanging fruit fixes and changes before auditors look at it. They should focus on security and gas optimisations we missed, should not have to have them find heaps of minor things we could have saw coming already like not putting natspec on some functions.
Changes:
-Removed some unneeded fields in events. E.g currentdebt in event of paying debt with collateral is always going to be 0 so not really needed.
-Allow borrower split into allow LP and allow Non LP Borrower. Makes it easier to call the functions, not needing to know which to put true or false but just call the right functions. Also function is smaller with less checks so more gas efficient.
-Revoke borrower doesn't really need to know what type of borrower they are it revokes same anyway.
-Natspec when there not there
-Few minor stuff here and there