Clean up blpapi utils

[armstrtw]

cleanup to move new util functions into blpapi_utils.cpp and move Lazyframe related code into bds which is the only remaining place it's used.

[eddelbuettel]

Great idea -- til we figure out how to totally avoid it, at least make it local.

[RockScience]

is #107 also an issue linked to Lazyframe?

[armstrtw]

Well, this is the fieldInfo from BBG for LAST_UPDATE:

id "PR024"
mnemonic "LAST_UPDATE"
datatype "Datetime"
ftype "DateOrTime"

So, we can address this in the new allocateDataFrame function. The problem is that most of the functions (bdp, bdh) still use populateDfRow to convert the bbg response to a dataframe, and that code still uses the BBG types to convert, so it's going to see BLPAPI_DATATYPE_DATE or BLPAPI_DATATYPE_TIME and that particular function assumes that the allocation function has already set up for a double (posix) or integer (date).

So, there's still some work to be done to connect the types we see at allocation time w/ the populateDfRow function. I don't think it's too hard, but just going to take some time to re-tool for this.

[RockScience]

Thank you for the detailed explanation, it is much more clear now.