PCI: log PCI device as bus:device.function tuple

Refers to comment in #417.
L4Linux: debug messages into file instead of pipe

Print Fiasco.OC kernel debugger messages into a file instead of a pipe
in the default l4linux run-script. Thereby rarely triggered issues by the
nightly running buildbot can be analyzed after the test failed.
dde_ipxe: use recent iPXE upstream version

Currently, we support the following NIC families:

- Intel gigabit ethernet (e1000, e1000e, igb)
- Intel eepro100
- Realtek 8139/8169

Fixes #423.
dde_ipxe: explicitly support x86_64

Fixes some obvious warnings and (maybe) hidden bugs.
L4Linux: dimension block cache correctly (fix #426)

In Genode's paravirtualized block driver a request cache is used to find again
Linux request structures via corresponding block-session packets. To work
correctly the cache needs to have at least the same size like the
block-session's queue-size.
Provide cpu_session_cap via environment object

Preparation to solve issue #10
Provide main thread cap via parent interface

Preparation to solve issue #10
Cleanup: remove 'first' and 'next' of cpu_session

Fixes #10
GDB monitor: move thread iterator declarations

This patch moves the thread iterator function declarations in GDB
monitor's 'Cpu_session_component' above the 'CPU session interface'
comment, because these functions are not part of the CPU session
interface anymore.

Fixes #10.
cxx: make 'operator delete(void *)' a weak symbol

The 'delete (void *)' operator gets referenced by compiler generated code,
so it must be publicly defined in the 'cxx' library. These compiler
generated calls seem to get executed only subsequently to explicit
'delete (void *)' calls in application code, which are not supported by
the 'cxx' library, so the 'delete (void *)' implementation in the 'cxx'
library does not have to do anything. Applications should use the
'delete (void *)' implementation of the 'stdcxx' library instead. To make
this possible, the 'delete (void *)' implementation in the 'cxx' library
must be 'weak'.

Fixes #419.
L4Linux: fix conversion bug (fix #409)
Noux: more useful gettimeofday() implementation

There are certain programs that need gettimeofday(), e.g.
network-related tools like ping(1) etc. but also filesystem-related
programs like find(1) etc. and of course time-related programs like
date(1).

As there is currently no interface in Genode for actually using clock
devices like RTC on x86 (though there is a driver for it) we "abuse"
the timeout_scheduler thread to at least provide flow-of-time.

Noux: add clock_gettime() implementation

For now, only CLOCK_SECOND is supported.

Noux: add utimes() dummy

Fixes #401
base-nova: 'Rm_client::unmap()' fix

Areas of an attached dataspace which have never been accessed cannot get
unmapped. With this patch this case is not treated as error anymore.

Fixes #398.
core: implement missing context area functions

This patch implements the following functions:

base:
- Context_area_rm_session::detach()
- Context_area_ram_session::free()

base-nova:
- unmap_local()

base-fiasco, base-pistachio:
- unmap_local() stub

This patch partially resolves issue #394.
Make nic_bridge's MAC address range configurable

By adding a "mac=XX:XX:XX:XX:XX:XX" attribute/value pair to the nic_bridge's
configuration one can define the first MAC address from which the nic_brigde
will allocate MACs for it's clients. Note: that the least relevant byte will
be ignored, and ranges from 0-255. Fixes #424.
Define board declarations in a more generic fashion

By naming all board declaration (previously in base/include/drivers/board) the
same way, and putting them in platform-specific include-pathes, we save additional
declaration redirection in the base-hw kernel, and in driver definitions.
Add xmlrpc++ library and test
cxx: make 'operator delete(void *)' a weak symbol

The 'delete (void *)' operator gets referenced by compiler generated code,
so it must be publicly defined in the 'cxx' library. These compiler
generated calls seem to get executed only subsequently to explicit
'delete (void *)' calls in application code, which are not supported by
the 'cxx' library, so the 'delete (void *)' implementation in the 'cxx'
library does not have to do anything. Applications should use the
'delete (void *)' implementation of the 'stdcxx' library instead. To make
this possible, the 'delete (void *)' implementation in the 'cxx' library
must be 'weak'.

Fixes #419.
Fix calculatorform.run
Introduce platform-specific services for core

By now all services in core where created, and registered in the generic
main routine. Although there exists already a x86-specific service (I/O ports)
there was no possibility to announce core-services for certain platforms only.
This commit introduces a hook function in the 'Platform' class, that enables
registration of platform-specific services. Moreover, the io-port service
is offered on x86 platforms only now.