Allow init_stream() to take unsigned size arguments #1575

Job	Run time
cppcheck	14m 33s
code formatting check	17s
min features with gcc	2m 37s
min features with g++	4m 24s
min features with clang	2m 18s
max features with gcc	3m 43s
max features with g++	2m 46s
max features with clang	3m 59s
max features with gcc and DEBUG	2m 5s
max features with gcc for 32-bit arch (legacy OS)	2m 1s
max features with g++ for 32-bit arch (legacy OS)	2m 21s
max features with clang for 32-bit arch (legacy OS)	2m 10s
	43m 14s

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