Increased kernel stack size by another page for 64-bit

* USB boot now works on x86_64 with PM.
Style fixes to HttpForm
Style fixes to HttpRequest
Documentation updates to HttpForm

Stub out missing method docs.
Documentation fixes to HttpRequest, fixes warnings.
Not in group libbe
Style fixes to FindDirectory
Comment out B_COMMON_ constants for now
Adjust repository files to changed repo URL.

* the repository URL should better define the type of repository (in
  this case: haikuports) and the branch (i.e. release) name.
packagefs: Package: Add versionedName property
packagefs: Add automatic SYS:PACKAGE_FILE attribute

* Rename SYS:PACKAGE attribute to SYS:PACKAGE_FILE.
* Re-add SYS:PACKAGE attribute. It contains the versioned name of the
  package.
BeBuild.h: Fix B_DEFINE_WEAK_ALIAS for use in C++ code
image.h: Add B_{APP,CURRENT}_IMAGE_SYMBOL macros

* Those can be used in cases where a pointer to an image symbol is
  required.
* Adjust BResources::SetToImage() accordingly.
Add new API find_path[s](), find_path_for_path()

The new functions are meant to replace many uses of find_directory():
* find_paths() is supposed to be used when the directories of a certain
  kind in all installation directories are needed (e.g. font
  directories, add-on directory, etc.). Using this API makes code
  robust wrt addition or removal of installation locations.
* find_path() is supposed to be used when files/directories associated
  with a loaded program, library, or add-on need to be found (e.g. data
  files or global settings).
* find_path_for_path() is similar to find_path(), but it starts from a
  given path instead of an image.
Add class BPathFinder

It's a more convenient C++ wrapper for the new find_path*() C functions.
Add findpaths command line tool

It provides the new find_path*() functionality to the shell.
FreeBSD compat layer: fixed bus_space_barrier for x86_64
x86_64: added wlan drivers to the image.
A few minor updates to the BView docs
BMenu: Some style fixes related to docs

Mostly just making the variable names match between the
header and source.

No functional change intended.