[SECURITY] Fixing potential XSS issues

Will resolve #926 once merged.
Merge pull request #930 from TheSerapher/issue-926

[SECURITY] Fixing potential XSS issues
Update POOLS.md
[FIX] Account Lockouts on Edit Account page

Fixes #939 once merged.
Merge pull request #940 from TheSerapher/issue-939

[FIX] Account Lockouts on Edit Account page
[FIX] PHP Notice on missing $aRoundShares

Fixes #941 once merged.
Merge pull request #942 from TheSerapher/issue-941

[FIX] PHP Notice on missing $aRoundShares
[FIX] Payout failure due to remaining balances

Fixes #943 once merged.
Merge pull request #944 from TheSerapher/issue-943

[FIX] Payout failure due to remaining balances