-use php_stream_make_seekable

Streams now make more use of the memory manager, so tracking down
leaking streams should be easier.
# I hate these big commits

#removed code to track down error in streams

-quick hack to bug in streams....but where?

-disabling debug
#Wez: i have an error when closing the original file after stream copy...

-fix bug for not correct terminated comments
-switch to streams
@exif functions now support streams using memory streams where @necessary (marcus)

New PHP streams...

-handling

-usability
-tests

-return size of thumbnail even if it not read

-support for array tags
-better memory handling
-support for thumbnails in TIFF format
-new functions exif_imagetype
@-new function exif_imagetype
@-exif_thumbnail fupports thumbn

-support for array tags
-better memory handling
-support for thumbnails in TIFF format
-new functions exif_imagetype
@-new function exif_imagetype
@-exif_thumbnail fupports thumbnails in TIFF format and can return size
@ of thumbnail

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-support for out of section data

-change IsColor from non zero to 1
-new test and example for documentation

-Support for IFD Arrays
#necessary for update/write operations

TIFF support for 'non' digicam files
# same as in standard/image.c but here it's more complex

- Fixed some compile warnings and removed bogus comments.

-comments
#just another jhead.c line

-comments

-missing efree
-incorrect index/length computing: left from jhead
#no errors left with test files - controlled manually with hexeditor

-new working thumbnail code
-everything uses new data structures
-new function exif_thumbnail
#nearly stripped off all jhead code
@read_exif_data is now an alias for exif_read_data

-new working thumbnail code
-everything uses new data structures
-new function exif_thumbnail
#nearly stripped off all jhead code
@read_exif_data is now an alias for exif_read_data
@ important to differenciate old/new version for tests)
@new function exif_tagname returns the names of tags
@new function exif_thumbnail extracts embedded thumbnail (Marcus)
#switched to internal version 1.2

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-fixes
-changed internal data structures
#nearly stripped off all jhead code

- Read IsColor for TIFF

- disabled debug information
- added missing width/height from primary ifd for TIFF

-addition to last change: php_image.h must be included now

Let getimagesize() and read_exif_data() share the same constants to
promote a little bit of code reuse here on two very similar problems.