most functionality to splashdwon, find neutral and start mission. short timeouts still in code for testing, will adjust to go directly to sit_idle after splashdown

Dependencies:   mbed MODSERIAL FATFileSystem

Revision:
89:0b8291dbf340
Parent:
85:dd8176285b6e
Child:
91:916ee0fea9ff
--- a/new_changelog.txt	Thu May 09 14:26:40 2019 +0000
+++ b/new_changelog.txt	Thu May 09 14:43:46 2019 +0000
@@ -85,7 +85,17 @@
         -  test size of log file and set new log file name and update logvers.txt
         -  allow for something other than 0=leg  in legfile.txt so that state will NOT drop into legfile.txt operations mode
         -  add access to leg_position_dive ( with exit??)  to menu operations  -maybe
-    DONE:  25 feb 2019  jcw
+25 feb 2019    DONE:   jcw
        -  added state ENDLEG_WAIT - will drop to keyboard/FLOAT_BROADCAST if char is read over xbee() while waiting
        - test time for log file to be cycled - in main.cpp
-       -  convert from feet to meters in depth().getposition()  calls ( deep inside outerloop() )
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+       -  convert from feet to meters in depth().getposition()  calls ( deep inside outerloop() )
+ 07may2019    DONE as of now   jcw
+       -  fixed version of posvelfilt that can deal with heading variables
+       -  state FLYING_IDLE  that is to be ended  by a pulldown on a DigitalIn line - presently has a timeout for  testing
+       -  state START_SWIM  that is started automatically from end of FLYING_IDLE and splashdown wait
+       -  Find_Neutral will run immediately if splashdown ends with FSG upside down, but START_SWIM will exit the mbed program
+          and return control to Raspberry PI for communications.
+       -  FIND_NEUTRAL  will be run if flag and file showing neutral found has not been set - this is important in my view
+          if find Neutral fails, file is written to warn raspberry PI
+       -  lots of flashing leds()  to indicate still running.
+       -  runs on bare board.  still to be tested with FSG  full system, or even pieces - such as imu().
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