Adding test for two Teros11 sensors

Based on simple logging, with no other sensors nor a radio. For testing issue
#276 (comment)
Presently working on this `sensor_calc` branch with `MS_SDI12_NON_CONCURRENT` defined, but this is a temporary fix as described in the issue.

sensor_tests/teros11_2ataTime/platformio.ini

@@ -0,0 +1,52 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; http://docs.platformio.org/page/projectconf.html
+
+[platformio]
+description = ModularSensors example menu_a_la_carte
+src_dir = utilities/teros11_2ataTime
+
+
+[env:mayfly]
+platform = atmelavr
+framework = arduino
+board = mayfly
+monitor_speed = 115200
+lib_ldf_mode = deep+
+lib_ignore = RTCZero
+build_flags =
+    -D SDI12_EXTERNAL_PCINT
+    -D NEOSWSERIAL_EXTERNAL_PCINT
+    -D TINY_GSM_RX_BUFFER=64
+    -D TINY_GSM_YIELD_MS=2
+    -D MQTT_MAX_PACKET_SIZE=240
+    ; -D ENABLE_SERIAL2
+    ; -D ENABLE_SERIAL3
+    -D MS_BUILD_TEST_XBEE_CELLULAR  ; Turn on first time w/ a Digi LTE-M module
+    ; -D MS_LOGGERBASE_DEBUG
+    -D MS_VARIABLEARRAY_DEBUG
+    ; -D MS_DATAPUBLISHERBASE_DEBUG
+    ; -D MS_ENVIRODIYPUBLISHER_DEBUG
+    -D MS_SDI12_NON_CONCURRENT  ; can help for Meter Teros11
+    -D MS_SDI12SENSORS_DEBUG
+    -D MS_SDI12SENSORS_DEBUG_DEEP
+    -D MS_METERTEROS11_DEBUG
+
+
+lib_deps =
+; Using ModularSensors *sensor_calc* branch (v0.30.0 ish) on 7/08/2021,
+; as temporary fix for two Teros11 sensors: https://github.com/EnviroDIY/ModularSensors/issues/276#issuecomment-876652538
+    https://github.com/EnviroDIY/ModularSensors.git#a56429d40f531cfb25016652594759d1d00ea230
+
+    https://github.com/PaulStoffregen/AltSoftSerial.git
+    https://github.com/SRGDamia1/NeoSWSerial.git
+    https://github.com/EnviroDIY/SoftwareSerial_ExternalInts.git
+;  ^^ These are software serial port emulator libraries, you may not need them
+
+    StreamDebugger