Renamed system cl-spread network.spread

* src/types.lisp (header): updated copyright
  (in-package network.spread): changed spread -> network.spread
* src/conditions.lisp: similar
* src/protocol.lisp: similar
* src/variables.lisp: similar
* src/connection.lisp: similar
* src/daemon.lisp: similar
* src/ffi.lisp: similar
* src/macros.lisp: similar
* src/fix-signal-handlers.lisp: similar
* src/package.lisp (package network.spread): renamed spread ->
  network.spread
* test/connection.lisp (header): update copyright
  (in-package network.spread.test): changed spread.test ->
  network.spread.test
* test/daemon.lisp: similar
* test/macros.lisp: similar
* test/variables.lisp: similar
* test/package.lisp (package network.spread.test): renamed spread.test
  -> network.spread.test
* network.spread.asd: renamed cl-spread.asd -> network.spread.asd
  (system network.spread): renamed cl-spread -> network.spread
  (system network.spread-test): renamed cl-spread-test -> network.spread-test
* README: adapted to renamed system and packages
* lift-standard.config: likewise
Changed license GPLv3 -> LLGPLv3; removed from file headers

* src/types.lisp (header): removed license text
* src/conditions.lisp: similar
* src/protocol.lisp: similar
* src/variables.lisp: similar
* src/connection.lisp: similar
* src/daemon.lisp: similar
* src/ffi.lisp: similar
* src/macros.lisp: similar
* src/fix-signal-handlers.lisp: similar
* src/package.lisp: similar
* test/variables.lisp: similar
* test/connection.lisp: similar
* test/daemon.lisp: similar
* test/macros.lisp: similar
* test/package.lisp: similar
* network.spread.asd  (header): removed license text
  (system network.spread): changed license GPLv3 -> LLGPLv3
  (system network.spread-test): likewise
* COPYING: changed license text GPLv3 -> LLGPLv3
Various cleanup and small improvements

* .bzrignore: deleted; no longer useful
* AUTHORS: added email-address
* src/conditions.lisp (header): updated copyright
  (spread-error::code): added documentation string
  (simple-spread-error): simplified report
  (connection-failed::name): added documentation string
* src/connection.lisp: (header): updated copyright; whitespace cleanup
* src/ffi.lisp (header): updated copyright
  (%poll): cosmetic change
  (%receive): likewise
  (%process-membership-message): likewise
  (%send-one): likewise
  (%extract-groups): more precise ftype declamation
* test/connection.lisp (header): added one-line summary; updated copyright
TODO temp commit2