fixup "base: extend thread test for stack alignment"

@m-stein the fixup reveals that the main thread has an unaligned stack.
This results from x86_64/crt0.s which uses init_main_thread_result as
stack pointer and aftwards _calls_ into _main. But, init_main_thread_result
equals stack_top() which is since @cproc's patch no longer
_call_-compatible but _jmp_-compatible.
hw: ease usage of the kernel log

ref #989
hw: use descriptive bool value names in ipc.cc

ref #989
hw: fix bug in IPC message-size calculation

ref #989
base: rename reload_parent_cap.cc

ref #989
base: provide env_context_area_rm_connection()

ref #989
base: provide helper class 'Placeable'

ref #989
base: provide helper class 'Reinitializable'

ref #989
noux: Noux_connection::context_area_rm_session()

This enables a forked process to update the capability of its
context area RM session.

ref #989
libc_noux & 64bit: fix printf format-warning

Normally for intptr_t the printf format PRIiPTR should be used. As Genode
printf doens't support this format we cast it to long int (intptr_t is int
for 32 bit and long int for 64 bit).

ref #989
noux & 64bit: fix printf format-warning

ref #989
base: make Expanding_parent_client reinitializable

This is needed to reinitialize Platform_env in forked processes.

ref #989
base: make Rm_connection reinitializable

This is needed to reinitialize Platform_env in a forked process later.

ref #989
foc: make cap_map and cap_alloc reinitializable

This is needed to reinitialize Platform_env in a forked process later.

ref #989
nova: make cap_map reinitializable

This is needed to reinitialize Platform_env in a forked process later.

ref #989
base: setup thread object for main thread in CRT0

For a main thread a thread object is created by the CRT0 before _main gets
called so that _main can already run in a generic environment that, e.g.,
catches stack overflows as a page-fault instead of corrupting the BSS.
Additionally dynamic programs have only one CRT0 - the one of the LDSO -
which does the initialization for both LDSO and program.

ref #989
base: ease Platform_env::Resources

It is unnecessary to remember session caps in a Resources object as the
contained connections can cast implicitely to the appropriate caps.

ref #989
noux_fork: raise MAX_COUNT to 1000

To see the output of both, forker and fork, we must give the test
more time on OKL4 as fork seems to be not so fast with this kernel.

ref #989
base: generic implementation of Context_allocator

ref #989
base: bin out-commented EH_FRAME stuff in CRT0s

ref #989