Added large unit tests for fftconvolve()
Added large unit tests for fftconvolve()

jramapuram/arrayfire,jramapuram/arrayfire,HolyGeneralK/arrayfire,hshindo/arrayfire,9prady9/arrayfire,asifmadnan/arrayfire,HolyGeneralK/arrayfire,victorv/arrayfire,munnybearz/arrayfire,merlin-ext/arrayfire,linan7788626/arrayfire,Keno/arrayfire,linan7788626/arrayfire,HolyGeneralK/arrayfire,linan7788626/arrayfire,pombredanne/arrayfire,mrgloom/arrayfire,hshindo/arrayfire,hshindo/arrayfire,umar456/arrayfire,arrayfire/arrayfire,mrgloom/arrayfire,shehzan10/arrayfire,arrayfire/arrayfire,unbornchikken/arrayfire,HolyGeneralK/arrayfire,9prady9/arrayfire,marbre/arrayfire,jramapuram/arrayfire,bkloppenborg/arrayfire,bkloppenborg/arrayfire,ghisvail/arrayfire,pentschev/arrayfire,hshindo/arrayfire,asifmadnan/arrayfire,umar456/arrayfire,pentschev/arrayfire,victorv/arrayfire,pentschev/arrayfire,Keno/arrayfire,jramapuram/arrayfire,umar456/arrayfire,pombredanne/arrayfire,umar456/arrayfire,victorv/arrayfire,merlin-ext/arrayfire,marbre/arrayfire,pombredanne/arrayfire,bkloppenborg/arrayfire,arrayfire/arrayfire,9prady9/arrayfire,pentschev/arrayfire,marbre/arrayfire,merlin-ext/arrayfire,victorv/arrayfire,ghisvail/arrayfire,shehzan10/arrayfire,bkloppenborg/arrayfire,Keno/arrayfire,mrgloom/arrayfire,linan7788626/arrayfire,unbornchikken/arrayfire,mrgloom/arrayfire,shehzan10/arrayfire,ghisvail/arrayfire,asifmadnan/arrayfire,asifmadnan/arrayfire,pombredanne/arrayfire,Keno/arrayfire,munnybearz/arrayfire,9prady9/arrayfire,unbornchikken/arrayfire,munnybearz/arrayfire,unbornchikken/arrayfire,ghisvail/arrayfire,shehzan10/arrayfire,merlin-ext/arrayfire,arrayfire/arrayfire,marbre/arrayfire