Pyastra Code

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New architecture
Full "Import" node support (don't confuse with "From" node!)
"Getattr" node support
"Halt" and "Sleep" lowlevel functions have been moved to lowlevel.py module

Minor:
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Option "--op-speed" has been removed
Filter-specific options have been added, "--icd" moved to tree_op2asm
Errors are written to stderr, not stdout
Added "--debug" option (for Pyastra debugging)
Added output of the current version at every start to ease maintenance.