Callgraph profiling support for graph_copy: ignore extra field in thunks when serializing; add extra field when deserializing

graph_copy: expect INT instead of dINT in exported_clean_symbol

See merge request !6

Move common functions copy_to_string and copy_from_string to new module graph_copy

See merge request !5

fix bug in copy_string_to_graph, adjust n_free_words when copying pointers in an array (memory is allocated on the stack AND the heap)

fix timeout by checking the socket for errors

Closes iTasks-SDK#348

See merge request !4

In the old situation when the connect didn't immediately return, the
socket was placed in a select.
An error was throws only when the socket was in the exceptset. However,
sockets are only in the exceptset in very particular cases (see man
select). Unable to connect is not one of those cases.

Therefore to actually check if a connection was refused, the error
status must be checked with getsockopt.

Remove ignored strictness annotations from StdLib

See merge request !3

Remove ignored strictness annotations in TCPChannels

See merge request !2

remove module graph_to_string_and_descriptors_macho, use graph_to_string_and_descriptors instead, remove graph_to_string_with_descriptors modules (old version of graph_to_string_and_descriptors that doesn't use additional information in descriptors for unboxed records in constructors or records)

Export replace_desc_numbers_by_descs from graph_copy_with_names

See merge request !1

move modules symbols_in_program, pecoff_symbols_in_program and macho_symbols_in_program to new folders linux, win and macosx

use is_using_desc_relative_to_array in module graph_copy_with_names, adjust descriptor addresses relative to the address of __ARRAY__ if necessary (because of position independent code)

use function is_using_desc_relative_to_array in module graph_to_string_and_descriptors, add the address of __ARRAY__ to descriptors if it yields 1 (to fix the descriptors for position independent code)

use abc instructions get_desc_arity_offset and load_module_name in module graph_to_string_and_descriptors_macho

use preprocessor symbol USE_DESC_RELATIVE_TO_ARRAY instead of MACH_O64 for array element descriptors also in copy_string_to_graph.c

use preprocessor symbol USE_DESC_RELATIVE_TO_ARRAY instead of MACH_O64 for array element descriptors in copy_graph_to_string.c

use abc instruction load_module_name in modules graph_copy_with_names and graph_to_string_and_descriptors