Log Message:
tex-circuitikz{,-doc}: update to 1.3.7

1.3.7
Minor release, mainly documentation upgrades.

- New options for the line thickness, rotation,
  and size of symbols drawn in sources
- New tutorial: drawing a circuit around an operational
  amplifier
- Documentation fixes and small enhancements

1.3.6
Mainly a bugfix release; fixing a bug in the `l2` stacked labels
 means that old constructs that were failing silently can give an
 error now. Sorry.
 To compensate, I added stacked annotation (for symmetry).

 - Added stacked annotations for symmetry with stacked labels.
 - Fixed a bug in the plotting of `inst amp ra` terminals.
 - Fixed a bug in managing stacked labels (`l2=...`); possibly it
   will be mildly backward-incompatible (please see the manual about
   incompatible changes)

1.3.5
Power electronics devices are the main characters in this release: PUT,
 GTOs, a new style for thyristors, and a photovoltaic module.
 Additionally, an **experimental** support for subcircuits has been
 added; it could change in the future.
 Fixed a nasty bug in rotary switches "in" anchor positioning in some \ 
cases.
 - Added support for creating and using sub-circuits
 - Added UJT transistors and GTO devices
 - Added (as an option) a different, more compact style for thyristor-type
   devices.
 - Added a photovoltaic module
 - Added a DC/DC converter block for symmetry
 - Added the possibility to change the waveforms shown in the oscilloscope
 - In the manual, separate the component usage chapter from the big
   component list
 - Fix wrong rotary switch "in" anchors for switches with more
   than 180 degrees coverage

1.3.4
New things, like configurable modifier thickness, ferroelectric devices,
 and several transistor tweaks. Importantly, a bug that hindered
 compatibility with the internal Ti*k*Z `circuits` library (introduced in
 1.3.3) has been fixed.
 - Added separate configuration for the line thickness of resistors,
   capacitors, and inductors modifiers
 - Added ferroelectric capacitors and ferroelectric gate MOS/FETs
 - Added an option to fill the gate gap in MOSes, FETs and IGBTs with a color
 - Added a "centergap" anchor for transistors
 - Added the option "nogate" to the `hemt` symbol
 - Fixed a bug in thermistors not respecting their class line thickness
 - Fixes in the manual (copy and paste of snippets without numbers, correct old
   usage of `siunitx`, factor out repetitions in the preamble; thanks to Ulrike
   Fischer: https://tex.stackexchange.com/a/57160/38080)
 - Fixed a bug introduced in 1.3.3 that would reduce compatibility with the
   `circuits` internal library; reported by JetherReis

1.3.2
- Added the simplified (2-waves) highpass and lowpass blocks
- Added graphene FETs (suggested by Cees Keyer)
- Added left/right anchors to transistors
- Fixed a bug in flip-flops

1.3.1
- Fixed a bug in "fuse" and "afuse" fill
- Remove the voltage direction warning. Nobody really ever cared
- Minor fixes and enhancements to the manual