Adjust configuration parameters to accomodate new settings

[Desrever Nu]

Existing configuration options need to be reviewed .

• Eliminate / hide deprecating parameters
• Add a new flag configuration parameter to bypass distributing tier2 liquidity if turned on (failback on 0.3.1 strategy with two orders)
• Adjust the web ui accordingly and web backend accordingly
• Document the changes to options and user manual (make a liquidity distribution setting)

Different from parameters specific to the model that will be handled in a separate ticket #807

[Desrever Nu]

Parameters to be renamed :

maxsellordervolume  
maxbuyordervolume
spread

Parameter to be systematically reviewed and documented and renamed

distributeliquidity   

[Desrever Nu]

All parameter that refers to orderbook will be contain the suffix book-

[Desrever Nu]

*maxsellordervolume --> bookSellwall

maxbuyordervolume --> bookBuywall*

We want to be able to manage the sell and buy spread separately. They become offsets.

In this context the old "spread" parameter cannot be simply renamed. We need to systematically delete old occurrences of the spread parameter (ticket #822 ) and then formalise two new parameters to be handled at book level.

distributeliquidity --> bookDisabletier2