Add compilation option to set memory size #433
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The kernel heap size is hardcoded to half the memory and at most 16MB because the allocator is too slow after that on QEMU without KVM support, and the processes use the rest of the memory.
A
MOROS_MEMORYenv var is introduced to be able to increase that hardcoded limit for applications that need more memory like those using bigint. This can also be set with the Makefile by doingmake image memory=...andmake qemu memory=....