RasdaPy_Update collection query should be executed as update query

[Bang Pham Huu]

There is a problem with checking which rasql query should run with read/write permission in RasdaPy.

Here is the problem code:

https://github.com/thunderboltsid/rasdapy/blob/master/rasdapy/core.py#L425

a update collection query like this

UPDATE test_rasdapy_mr SET test_rasdapy_mr[0:255,0:210] ASSIGN shift(decode(<[0:0] 1c>, "GDAL", "{\"filePaths":[\"/home/rasdaman/TEST/rasdapy/tests/mr_1.png\"]}"), [0,0])

is considered as read query.

Also, this code needs to be fixed to make the comparison insensitive as in rasql (e.g: SELECT, seLECT, select,…) are valid cases.

It also missed the SELECT INTO which is an update query not read query.