tool: call PR_Cleanup() on exit if NSPR is used

This prevents valgrind from reporting possibly lost memory that NSPR
uses for file descriptor cache and other globally allocated internal

tool: call PR_Cleanup() on exit if NSPR is used

This prevents valgrind from reporting possibly lost memory that NSPR
uses for file descriptor cache and other globally allocated internal
data structures.

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tool: Moved --libcurl to the global config

tool: Moved --stderr to the global config

tool_main: Fixed a memory leak on main_init error

tool: Moved --trace and --verbose to the global config

tool_main: Forgot to initialise the first operation's global pointer

tool: Moved --showerror to the global config

Other global options such as --libcurl, --trace and --verbose to
follow.

tool_operate: Moved easy handle cleanup into tool_main

tool_main: Moved easy handle into global config structure

tool_main: Corrected typo from commit d6b9f054e9 in Symbian code

tool_main: Moved OperateConfig cleanup into main_free()

tool_main: Moved initial OperateConfig creation into main_init()

tool_cfgable: Added global config structure

tool_cfgable: Renamed Configurable structure to OperationConfig

To allow for the addition of a global config structure and prevent
confusion between the two.

tool_operate: Start to use CURLcode rather than int for return codes

To help assist with the detection of incorrect return codes, as per
commits ee23d13a79, 33b8960dc8 and aba98991a5, up

tool_operate: Start to use CURLcode rather than int for return codes

To help assist with the detection of incorrect return codes, as per
commits ee23d13a79, 33b8960dc8 and aba98991a5, updated the operate
based functions to return CURLcode error codes.

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tool_getparam: Added support for parsing of specific URL options

tool_cfgable: For consistency renamed init_config() to config_init()

tool_cfgable: Introduced config_free() function

tool_operate: Moved libcurl information gathering to tool_main

tool_operate: Moved main initialisation and cleanup code into tool_main

tool_main: Fixed compilation warning from commit 0104678c79

no previous prototype for function 'memory_tracking_init'

tool_main: Changed stack based config struct to be heap based

tool_operate: Moved memory tracking initialisation into tool_main

tool_main: Moved config struct initialisation into a separate function

In preparation for adding URL specific options moved the initialisation
of the Configurable structure into a separa

tool_main: Moved config struct initialisation into a separate function

In preparation for adding URL specific options moved the initialisation
of the Configurable structure into a separate function in tool_cfgable.

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src/Makefile.am: build static lib for unit tests if enabled