2022-09-21 bitCNY parameter adjustment: disabled borrowing (temporarily)

[abit]

2022-09-21 bitCNY parameter adjustment:
* disabled borrowing (temporarily)

Reason:
Mitigate potential systematic risks due to market volatility.

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Current bitCNY parameters:

ICR (Initial collateral ratio) 175%
MCR (Maintenance collateral ratio) 160%
MSSR (Maximum short-squeeze ratio) 105%
MCFR (Margin call fee rate) 3%
FSFP (Force settlement fee percent) 3%
FSO (Force settlement price offset) 2%
Force settlement delay 24 hour
Maximum force settlement volume per hour 0.5%
BSRM (Black swan response method) : individual settlement to fund
Minimum feeds 3
Price feed producers list:
1.2.183     hiquanta
1.2.35248   in.abit
1.2.987999  zapata42-witness
1.2.1031601 btspp-witness

Borrowing is disabled.
Force-settlement is enabled.