Documentation for $SET OBLONG, and its effect on lump-sum investment cost re

[Antti-L]

When the MID_YEAR option is used, the accounting of the investment costs is changed basically only for Cases 1.a and 1.b, because Cases 2.a and 2.b were already compliant with the MID_YEAR assumption. However, with this option one may be inclined to adopt the interpretation that the centers of gravity of the construction costs should also be located in the middle of each year over the lead time, equivalent to moving the commissioning year half a year backwards, in the same way as it is done for Cases 1.a and 1.b. This would effectively be simply meaning that the reported LUMPINV values should be reduced accordingly, by the half year's interest, which are currently included in the LUMPINV values. The objective function (and the raw model solution) would remain unchanged.

If there is a common agreement over this refined interpretation, I could submit this change into the LUMPINV reporting for the next release.